View source for Mike Castle

{{Short description|American politician (1939–2025)}}
{{For|the American actor|Mike Castle (actor)}}
{{Use American English|date=December 2022}}
{{Use mdy dates|date=August 2025}}
{{Infobox officeholder
| name          = Mike Castle
| image         = Mike Castle official portrait.jpg
| caption       = Official portrait, 2006
| state         = [[Delaware]]
| district      = {{ushr|DE|AL|at-large}}
| term_start    = January 3, 1993
| term_end      = January 3, 2011
| predecessor   = [[Tom Carper]]
| successor     = [[John Carney (Delaware politician)|John Carney]]
| order1        = 69th [[Governor of Delaware]]
| lieutenant1   = [[S. B. Woo]]<br>Dale E. Wolf
| term_start1   = January 15, 1985
| term_end1     = December 31, 1992
| predecessor1  = [[Pete du Pont]]
| successor1    = [[Dale E. Wolf]]
| office2       = 20th [[Lieutenant Governor of Delaware]]
| governor2     = Pete du Pont
| term_start2   = January 20, 1981
| term_end2     = January 15, 1985
| predecessor2  = [[James D. McGinnis]]
| successor2    = [[S. B. Woo]]
| state_senate3 = Delaware
| district3     = [[Delaware's 1st Senate district|1st]]
| term_start3   = January 7, 1969
| term_end3     = January 4, 1977
| predecessor3  = Russell Dineen
| successor3    = [[Harris McDowell III]]
| state_house4  = Delaware
| district4     = 6th
| term_start4   = January 3, 1967
| term_end4     = January 7, 1969
| predecessor4  = Frank Parisi
| successor4    = George Hering
| birth_name    = Michael Newbold Castle
| birth_date    = {{Birth date|1939|7|2}}
| birth_place   = [[Wilmington, Delaware]], U.S.
| death_date    = {{Death date and age|2025|8|14|1939|7|2}}
| death_place   = [[Greenville, Delaware]], U.S.
| party         = [[Republican Party (United States)|Republican]]
| spouse        = {{Marriage|Jane DiSabatino|1992}}
| education     = [[Hamilton College]] ([[Bachelor of Science|BS]])<br>[[Georgetown University]] ([[Bachelor of Laws|LLB]])
| module        = {{Listen|pos=center|embed=yes|filename=Rep. Mike Castle Speaks in Support of H.R.902, the Presidential $1 Coin Act of 2005.ogg|title=Castle's voice|type=speech|description=Castle supporting the Presidential $1 Coin Act of 2005.<br>Recorded April 26, 2005}}
}}

'''Michael Newbold Castle''' (July 2, 1939 – August 14, 2025) was an American politician and lawyer who served as the [[United States House of Representatives|U.S. representative]] for {{ushr|DE|AL}} from 1993 to 2011. A member of the [[Republican Party (United States)|Republican Party]], he previously served as the [[List of governors of Delaware|69th Governor of Delaware]] from 1985 to 1992, [[Lieutenant Governor of Delaware|Lieutenant Governor]] from 1981 to 1985, and as a member of the [[Delaware General Assembly]] from 1967 to 1977. As of 2025, Castle was the most recent Republican to represent Delaware in the U.S. Congress and the last Republican to have been elected governor of the state.

The district Castle represented includes the entire state of Delaware and is the oldest intact surviving district in the nation. He was the longest-serving U.S. Representative in the state's history.<ref name=whyy>{{cite news|date=October 6, 2009|work=WHYY|title=Rep. Mike Castle announces run for U.S. Senate|url=http://whyy.org/cms/news/government-politics/2009/10/06/rep-mike-castle-announces-run-for-u-s-senate/19300|access-date=December 15, 2009|archive-url=https://web.archive.org/web/20091106092505/http://whyy.org/cms/news/government-politics/2009/10/06/rep-mike-castle-announces-run-for-u-s-senate/19300|archive-date=November 6, 2009|url-status=dead}}</ref> 

On October 6, 2009, Castle announced his candidacy in the [[United States Senate special election in Delaware, 2010|2010 special election]] for the seat in the [[United States Senate]] held by [[Democratic Party (United States)|Democrat]] [[Ted Kaufman]].<ref name=announcement>{{cite news|date=October 6, 2009|work=FOX News|title=Delaware GOP Congressman to Run for Biden's Former Senate Seat|url=http://www.foxnews.com/politics/2009/10/06/delaware-gop-congressman-run-bidens-senate-seat|access-date=February 1, 2010|archive-url=https://web.archive.org/web/20151018225334/http://www.foxnews.com/politics/2009/10/06/delaware-gop-congressman-run-bidens-senate-seat/|archive-date=October 18, 2015|url-status=dead}}</ref> Kaufman, appointed by Governor [[Ruth Ann Minner]] to fill the vacancy created by [[Joe Biden]] (who resigned to become vice president of the United States), was not a candidate in the election.<ref name=kaufman>{{cite news|date=November 25, 2008|work=FOX News|title=Longtime Biden aide picked to fill his Senate seat|url=http://www.foxnews.com/wires/2008Nov25/0,4670,BidenSenate,00.html|first=Sarah|last=Brumfield|access-date=February 1, 2010|archive-url=https://web.archive.org/web/20110604065650/http://www.foxnews.com/wires/2008Nov25/0,4670,BidenSenate,00.html|archive-date=June 4, 2011|url-status=dead}}</ref> The election determined who would fill the balance of Biden's term, which ended on January 3, 2015. In one of the most surprising election results of 2010, Castle lost the Republican primary to [[Christine O'Donnell]].<ref>{{cite news| url=http://voices.washingtonpost.com/thefix/senate/christine-odonnell-upsets-mike.html| archive-url=https://archive.today/20120723085949/http://voices.washingtonpost.com/thefix/senate/christine-odonnell-upsets-mike.html| url-status=dead| archive-date=July 23, 2012|newspaper=The Washington Post|title=Christine O'Donnell upsets Mike Castle in Delaware Senate primary}}</ref> He would have been heavily favored in the general election against [[Democratic Party (United States)|Democrat]] [[Chris Coons]], who defeated O'Donnell by 17 percentage points.<ref>{{cite web|url=http://www.rasmussenreports.com/public_content/politics/elections/election_2010/election_2010_senate_elections/delaware/election_2010_delaware_senate|title=Election 2010: Delaware Senate|publisher=Rasmussenreports.com|access-date=January 4, 2011}}</ref>

==Early life and education==
Michael Newbold Castle was born on July 2, 1939, in [[Wilmington, Delaware]], the son of Louisa Johnston (née Bache) and James Manderson Castle Jr.<ref>{{cite book|last=Barone|first=Michael|author-link=Michael Barone (pundit)|author2=Richard E. Cohen|author3=Grant Ujifusa|title=The Almanac of American Politics|publisher=National Journal Group|year=2008|location=Washington, D.C.|page=370|url= }}</ref><ref>{{cite news|url = https://www.newspapers.com/image/164707823/|title = Castle: Election rival offers prayers|date = September 24, 2006|newspaper = [[The News Journal]]|page = B3|via = [[Newspapers.com]]|url-access = subscription|accessdate = August 14, 2025}}</ref> One of his maternal great-great-grandfathers was Virginia [[U.S. Senator]] [[John W. Johnston]], and Castle's fifth great-grandfathers were founding fathers [[Benjamin Franklin]] and [[Daniel Carroll]]. Castle's father was a [[patent lawyer]] for [[DuPont]], a firm so central to the city that it was long known in Wilmington simply as "the company." After graduating from [[Tower Hill School]] in 1957, he attended [[Hamilton College (New York)|Hamilton College]] in [[Clinton, Oneida County, New York]]. He earned a Bachelor of Science degree in economics from Hamilton in 1961.<ref>{{cite web|url= http://www.hamilton.edu/news/story/delaware-congressman-alumnus-mike-castle-to-deliver-commencement-address|title= Delaware Congressman, Alumnus Mike Castle to Deliver Commencement Address|publisher=Hamilton College|access-date=July 11, 2014}}</ref> While at Hamilton, Castle was a brother of the [[Alpha Delta Phi]] fraternity.<ref>{{Cite web |title=Alpha Delta Phi Fraternity {{!}} Notable Alumni |url=https://www.alphadeltaphi.org/notable-alumni |access-date=August 15, 2025 |website=Alpha Delta Phi |language=en}}</ref><ref>{{Cite web |title=Notable Alpha Delts – Alpha Delta Phi Society |url=https://www.adps.org/home/society/notable-alpha-delts/ |access-date=August 15, 2025 |website=www.adps.org}}</ref>

In 1964, he earned a [[Juris Doctor]] degree from [[Georgetown University Law Center]] in Washington, D.C. He was [[Admission to the bar in the United States|admitted to both the Delaware Bar and the Washington, D.C., Bar]] that same year.<ref>{{Cite web|url=https://www.wgmd.com/former-governor-u-s-congressman-mike-castle-dies-at-86/|website=WGMD.com|title=UPDATED: Funeral Services Announced for Former Governor, U.S. Congressman Mike Castle|date=August 15, 2025|author=Ciccanti, Joe}}</ref>

==Professional and political career==
Following his admission to the bar, Castle returned to Wilmington and joined Connolly, Bove and Lodge, working as an associate (1964–1973) and later partner (1973–1975). A [[Republican Party (United States)|Republican]], he served as [[Deputy Attorney General]] of Delaware from 1965 to 1966, and was elected to the [[Delaware House of Representatives]] in 1966. He served as a state representative for two years before winning a seat in the [[Delaware Senate]], where he remained for eight years. He also served as [[minority leader]] from 1975 to 1976.<ref name=success>{{Cite news|url=https://www.newspapers.com/article/the-news-journal/179192486/|newspaper=[[The News Journal]]|via=[[Newspapers.com]]|date=April 5, 1999|page=1, [https://www.newspapers.com/article/the-news-journal/179192270/ 5]|title=Mike Castle: A moderate success|author=Weiser, Carl}} {{Open access}}</ref><ref>{{Cite web|url=https://www.desu.edu/news/2013/09/former-gov-us-rep-mike-castle-sworn-dsu-board-member|publisher=[[Delaware State University]]|title=Former Gov. and U.S. Rep. Mike Castle sworn in as DSU Board member|date=September 20, 2013}}</ref>

In 1976, Castle left the state legislature and returned to the full-time practice of law, founding his own firm with Carl Schnee (who was later nominated as [[United States District Court for the District of Delaware|U.S. Attorney for the District of Delaware]] by President [[Bill Clinton]] in 1999). He returned to politics in 1980, when he was recruited to run for [[Lieutenant Governor of Delaware]] by [[List of governors of Delaware|Governor]] [[Pete du Pont]].<ref name=success/> He defeated [[Democratic Party (United States)|Democratic]] state senator [[Thomas B. Sharp]], with 59% to 40% of the vote.<ref name=USA>{{cite web |url=https://uselectionatlas.org/RESULTS/state.php?fips=10&year=1980&f=0&off=6&elect=0 |title=1980 Lt. Gubernatorial General Election Results - Delaware |publisher=uselectionatlas.org |date=July 6, 2012 |access-date=November 15, 2024}}</ref> He served from 1981 to 1985.<ref name=success/>

==Governor of Delaware==
[[File:Castle, Thornburgh, and Weinberger at the Pentagon, July 6, 1982.JPEG|thumb|Lt. Governor Castle (left) with Governor [[Dick Thornburgh]] of Pennsylvania (center) and Secretary of Defense [[Caspar Weinberger]], July 1982.]]
As the hand-picked choice of the popular Governor du Pont, Castle easily won election as Governor of Delaware in 1984, defeating former [[Delaware Supreme Court]] Justice [[William T. Quillen]].<ref>{{Cite web|url=https://www.wdel.com/news/delaware-mourns-former-chief-justice-secretary-of-state-quillen/article_fd84dad1-36ad-523a-a626-ae256a4bc034.html|website=WDEL.com|title=Delaware mourns former chief justice, secretary of state Quillen |author=Bossert, Brandon|date=August 20, 2016}}</ref><ref name=popular>{{Cite news |last1=Cormier |first1=Ryan |last2=Talorico |first2=Patricia |date=August 15, 2025|url=https://archive.today/20250816014553/https://www.delawareonline.com/story/news/2025/08/14/michael-castle-former-delaware-governor-congressman-dies-86/74996880007/|newspaper=[[The News Journal]]|via=[[archive.today]]|title=For decades, he was Delaware's most popular politician. Mike Castle dies at age 86}}</ref> Voters re-elected him to another term in 1988 when he defeated Democrat Jacob Kreshtool by 99,479 votes, and is the last time a Republican won a governor election in the state.<ref>{{Cite book|url=https://books.google.com/books?id=JDjrCQAAQBAJ&dq=mike+castle+kreshtool&pg=RA9-PA1987|title=Guide to U.S. Elections|date=December 24, 2015 |isbn=9781483380384|publisher=SAGE Publications|page=1987}}</ref> Castle cut his second term slightly short when he resigned to begin his first term as U.S. Representative.<ref>{{Cite news|url=https://www.newspapers.com/article/philadelphia-daily-news/179196574/|newspaper=[[Philadelphia Daily News]]|via=[[Newspapers.com]]|date=January 4, 1993|page=16|title=Wolf in Delaware}} {{Open access}}</ref>

One of Castle's priorities as governor was [[welfare reform]]. He worked to pass a comprehensive welfare reform package with the White House and Congress and also served as lead governor on welfare reform on the [[National Governors Association]].<ref>{{Cite web|url=https://www.coasttv.com/news/former-delaware-gov-and-congressman-mike-castle-dies-at-86/article_0592fa62-f7cf-4af8-ad06-1654add3e648.html|website=Coast TV|title=UPDATE: Former Delaware Gov. and Congressman Mike Castle dies at 86|author=Seagraves, Torie|date=August 15, 2025}}</ref> He worked on the largest road-construction project in state history, with his administration establishing the Transportation Trust Fund that paid for the construction of [[Delaware Route 1]].<ref name=success/><ref name=popular/> He also worked on the improvement of schools, supported the preservation of farmland, and backed "banking industry expansion and anti-takeover legislation for corporations".<ref name=success/><ref name=popular/>

==United States Representative==
[[File:Castlemn.jpg|125px|thumb|Castle during the [[109th United States Congress|109th Congress]]]]

===Committee assignments===
* [[United States House Committee on Education and the Workforce|Committee on Education and Labor]]
** [[United States House Education Subcommittee on Early Childhood, Elementary and Secondary Education|Subcommittee on Early Childhood, Elementary and Secondary Education]] (Ranking Member)
** [[United States House Education Subcommittee on Higher Education, Lifelong Learning, and Competitiveness|Subcommittee on Higher Education, Lifelong Learning, and Competitiveness]]
* [[United States House Committee on Financial Services|Committee on Financial Services]]
** [[United States House Financial Services Subcommittee on Capital Markets, Insurance, and Government-Sponsored Enterprises|Subcommittee on Capital Markets, Insurance, and Government-Sponsored Enterprises]]
** [[United States House Financial Services Subcommittee on Financial Institutions and Consumer Credit|Subcommittee on Financial Institutions and Consumer Credit]]
** [[United States House Financial Services Subcommittee on Domestic Monetary Policy and Technology|Subcommittee on Domestic Monetary Policy and Technology]]

In [[1992 Delaware gubernatorial election|1992]], Castle could not run again for Governor, due to constitutional term limits. The result was what became known as "the Swap." Castle ran for the seat of U.S. Representative [[Tom Carper]] and Carper ran for Governor. Delaware's political leadership had quietly worked out the arrangement and retained the services of two very popular office holders. Both Castle and Carper won their races by large margins.<ref>{{Cite web|url=https://www.delawarepublic.org/show/the-green/2024-12-13/senator-tom-carper-looks-back-on-decades-of-public-service-as-he-prepares-to-leave-office|website=DelawarePublic.org|title=Senator Tom Carper looks back on decades of public service as he prepares to leave office |author=Nagengast, Larry|date=December 13, 2024}}</ref>

Castle was first elected U.S. Representative in 1992, defeating former Lieutenant Governor [[Shien Biau Woo]]. Later, he won election by wide margins eight times, defeating Democrats Carol Ann DeSantis in 1994, [[Dennis E. Williams]] in 1996 and 1998, Michael C. Miller in 2000 and 2002, Paul Donnelly in 2004, Dennis Spivack in 2006, and Karen Hartley-Nagle in 2008.<ref>{{Cite web|url=https://www.legistorm.com/person/bio/51319/Michael_Newbold_Castle.html|website=LegiStorm.com|title=Former Rep. Mike Castle|access-date=August 18, 2025}}</ref> He suffered two minor strokes during the [[2006 Delaware congressional election|2006 campaign]], but fully recovered.<ref>{{Cite news|url=https://thehill.com/homenews/news/9727-castle-to-suffer-no-lasting-effects-from-strokes/|newspaper=[[The Hill (newspaper)|The Hill]]|title=Castle to suffer no lasting effects from strokes|date=September 26, 2006}}</ref>

Castle was the co-chair of several Congressional caucuses, including the Diabetes Caucus, the Community College Caucus, the Biomedical Research Caucus, and the Passenger Rail Caucus. He was also considered one of the most moderate Republicans in the U.S. House. In the wake of [[Tom DeLay]]'s indictment in September 2005, liberal columnist [[E.J. Dionne]] named Castle as one of four lawmakers capable of leading an anticorruption reform of the Republican Party. Castle was a member of various [[Rockefeller Republican|liberal Republican]] Organizations, such as [[Republicans For Environmental Protection]], The [[Republican Majority For Choice]], [[Republicans For Choice]], and [[Christine Todd Whitman]]'s Its My Party Too. He was [[Abortion-rights movements|pro-choice]] and supported some [[gun control]] measures.<ref>{{Cite web|url=https://abcnews.go.com/Politics/delaware-senate-race-kamikaze-republican-tea-party/story?id=11627467|title=Delaware Senate Race: A Kamikaze Republican and the Tea Party|date=September 14, 2010|website=ABC News|language=en|access-date=July 8, 2018}}</ref> He voted against a [[constitutional amendment]] that would have banned [[same-sex marriage]].<ref>{{Cite web|url=http://www.ontheissues.org/House/Michael_Castle.htm|title=Michael Castle on the Issues |website=OnTheIssues.org |access-date=July 8, 2018}}</ref> The non-partisan ''[[National Journal]]'' gave Mike Castle an ideological composite score of 59% conservative and 41% liberal.<ref>{{Cite web|url=https://votesmart.org/candidate/evaluations/26792/mike-castle#.W0J5lLRmVBU|title=Mike Castle's Rating and Endorsements|website=votesmart.org}}</ref>

Castle's centrist positions served him well in a state that trended increasingly Democratic during his tenure in the House.  Delaware had long been reckoned as a [[bellwether]], but has voted Democratic in every presidential election since 1992, due almost entirely to heavily Democratic [[New Castle County]].  At the same time, his centrist record made him the target of conservative groups such as [[Club for Growth]], who ranked him the least conservative Republican in the U.S. House in 2008, and RemoveRINOs, who, in April 2010, named him the Ace of Spades on its most-wanted list.<ref>{{Cite web|url=http://www.clubforgrowth.org/projects/scorecard/?year=2009&chamber=2|website=ClubForGrowth.org|title=Senate Legislation, Congressional Voting Records|archive-url=https://web.archive.org/web/20101101041107/http://www.clubforgrowth.org/projects/scorecard/?year=2009&chamber=2 |archive-date=November 1, 2010 |via=[[Wayback Machine]]}}</ref><ref>{{Cite web|url=http://removerinos.com/CastleM.html|website=RemoveRINOs.com|via=[[Wayback Machine]]|title=Mike Castle |archive-url=https://web.archive.org/web/20100909021301/http://removerinos.com/CastleM.html |archive-date=September 9, 2010 }}</ref>

In February 2004, Castle sponsored H.R. 3831 to reauthorize the assault weapons ban of 1994. The bill was co-sponsored by 11 Republican colleagues and 129 Democrats.<ref>{{USBill|108|H.R.|3831}}</ref> In June 2008, Rep. [[Mark Kirk]], R-IL, introduced H.R. 6257 to reinstate the ban, and Castle was one of the bill's four Republican co-sponsors.<ref>{{USBill|110|HR|6257}}</ref> Both bills died in committee.

Castle co-sponsored the [[Stem Cell Research Enhancement Act]]. The bill proposed expanding the number of [[embryonic stem cell]] lines that are eligible for federally funded research, expecting that this funding would generate more research and ultimately greater progress in developing new treatments for a wide range of [[Embryonic Stem Cell#Utilities|medical conditions]].<ref>{{Cite web|url=https://www.science.org/content/article/embryonic-stem-cell-bill-passes-house|website=Science.org|title=Embryonic Stem Cell Bill Passes House|date=May 25, 2005|author=Holden, Constance|archive-url=https://web.archive.org/web/20250818215229/https://www.science.org/content/article/embryonic-stem-cell-bill-passes-house |archive-date=August 18, 2025 |via=[[Wayback Machine]]}}</ref> After successfully passing both the U.S. Senate and the U.S. House, it received U.S. President [[George W. Bush]]'s first presidential veto in July 2006.<ref>{{Cite web|url=https://www.nbcnews.com/id/wbna13934199|publisher=[[NBC News]]|title=Bush vetoes stem cell bill; House can't override |date=July 19, 2006}}</ref>

In December 2010, Castle was one of fifteen Republican House members to vote in favor of repealing the [[United States military]]'s "[[Don't Ask, Don't Tell]]" ban on [[openly gay]] service members.<ref name=metro_weekly_20101215>Chris Geidner, [http://www.metroweekly.com/poliglot/2010/12/breaking-house-passes-dadt-rep.html House Passes DADT Repeal Bill] {{webarchive|url=https://web.archive.org/web/20131021205547/http://www.metroweekly.com/poliglot/2010/12/breaking-house-passes-dadt-rep.html |date=October 21, 2013 }}, ''[[Metro Weekly]]'' (December 15, 2010).</ref><ref name=nytimes_20101215>[http://politics.nytimes.com/congress/votes/111/house/2/638 House Vote 638 – Repeals 'Don't Ask, Don't Tell'] {{webarchive|url=https://web.archive.org/web/20160118070035/http://politics.nytimes.com/congress/votes/111/house/2/638 |date=January 18, 2016 }}, ''[[New York Times]]'' (December 15, 2010).</ref>

During his time in Congress, Castle was known for his interest in [[numismatics]]. In 1995, he authored the legislation that created the [[American Platinum Eagle]] [[platinum bullion coin]]. He later sponsored the legislation that created the [[50 State quarters]], [[Sacagawea dollar]], [[presidential dollar coins]], and [[America the Beautiful quarters]] programs, and several [[commemorative coin]]s.<ref name=Coin2022>[https://www.coinnews.net/2022/05/06/ngc-honors-mike-castle-with-new-congressional-series-label/ NGC Honors Mike Castle with New Congressional Series Label] {{Webarchive|url=https://web.archive.org/web/20221025154625/https://www.coinnews.net/2022/05/06/ngc-honors-mike-castle-with-new-congressional-series-label/ |date=October 25, 2022 }}, ''CoinNews.net'' (May 6, 2022).</ref> His activity led the [[Numismatic Guaranty Company]] to deem him "The Coinage Congressman."<ref name=Coin2022/> Castle drafted one sentence of the 1997 Omnibus Consolidated Appropriations Act: "Notwithstanding any other provision of law, the [[Secretary of the Treasury]] may mint and issue [[platinum coin]]s in such quantity and of such variety as the Secretary determines to be appropriate." His intent was to make it easier for the Treasury to mint platinum coins for the [[coin collector]] market, but the sentence allows the Treasury Department to mint platinum coinage in any denomination. In the event that Congress refused to raise the [[U.S. debt ceiling]], the Treasury could thus mint a [[trillion-dollar coin]] to avoid [[Sovereign default|default]]. This maneuver has been proposed by some commentators, but has never been done.<ref>{{cite news|title=Treasury: We won't mint a platinum coin to sidestep the debt ceiling|url=https://www.washingtonpost.com/blogs/wonkblog/wp/2013/01/12/treasury-we-wont-mint-a-platinum-coin-to-sidestep-the-debt-ceiling/?hpid=z1|newspaper=Washington Post|access-date=January 12, 2013}}</ref>

In November 2009, Castle's district was profiled by [[Stephen Colbert]] in his segment "Better Know a District."<ref>{{Cite news|url=https://www.trentonian.com/2009/11/24/video-better-know-a-district-mike-castle/|newspaper=[[The Trentonian]]|title=Video: Better Know A District – Mike Castle |date=November 24, 2009}}</ref>

==2010 Senate campaign==
{{main|2010 United States Senate special election in Delaware#Republican primary}}
In 2010, Castle ran to be the Republican candidate to fill the seat of former Senator [[Joe Biden]], who had become vice president on January 20, 2009. Castle was defeated in the Republican primary on September 14, 2010, by [[Christine O'Donnell]], the [[Tea Party movement|Tea Party]] favorite. The primary drew 57,000 voters, a small slice of the overall electorate. After the primary, [[Fairleigh Dickinson University]]'s PublicMind twice polled Delaware voters, running a hypothetical match-up between Castle and the Democratic candidate, [[Chris Coons]]; in it, Castle beat Coons by a 21-point margin (54%–34%) and also had a favorable rating of 48% compared to O'Donnell's 34%.<ref>{{cite web|url=http://publicmind.fdu.edu/winsome/final.pdf |title=O'Donnell Winning Tea Party, Losing Delaware |website=Publicmind.fdu.edu |access-date=June 16, 2017}}</ref> Castle refused to support O'Donnell in the Senate campaign against Coons.<ref>{{cite web|url=https://www.politico.com/story/2010/09/castle-wont-endorse-odonnell-042206|title=Mike Castle Won't Endorse Christine O'Donnell|publisher=Politico|author=David Catanese|date=September 15, 2010}}</ref>  Coons went on to defeat O'Donnell decisively in the general election.<ref>{{Cite news|url=https://www.latimes.com/archives/la-xpm-2010-nov-02-la-pn-coons-odonnell-final-story.html|newspaper=[[Los Angeles Times]]|title=Chris Coons defeats 'tea party'-backed Christine O'Donnell in Delaware Senate race|author=Memoli, Michael A.|date=November 2, 2010}}</ref>

In June 2010, Castle was one of only two Republicans to vote in favor of the [[DISCLOSE Act]], intended to limit spending on political campaigns by corporations in the wake of the 
[[U.S. Supreme Court]]'s decision in ''[[Citizens United v. Federal Election Commission]]''. The bill requires added disclosure for political spending by corporations and prohibits some [[corporate political spending]].<ref>{{cite web|last=von Spakovsky |first=Hans A. |author-link=Hans A. von Spakovsky |title=The Fight over the DISCLOSE Act Is Far from Over |publisher=[[National Review]] |date=June 24, 2010 |url=http://corner.nationalreview.com/post/?q=ZGYzNDY5MTBkOWI1MDQ3ZWQ1NWFlYzU0YmIzZjI4NjY= |archive-url=https://archive.today/20120708112028/http://corner.nationalreview.com/post/?q=ZGYzNDY5MTBkOWI1MDQ3ZWQ1NWFlYzU0YmIzZjI4NjY= |url-status=dead |archive-date=July 8, 2012 |access-date=June 25, 2010 }}</ref>

===Town hall===
A [[Town hall meeting|town hall style meeting]] organized by Castle to discuss [[Health care reform in the United States|health care reform]] with constituents<ref name="delawareonline1">[http://www.delawareonline.com/article/20090721/NEWS/307210003] {{webarchive|url=https://web.archive.org/web/20090724082909/http://www.delawareonline.com/article/20090721/NEWS/307210003|date=July 24, 2009}}</ref> was featured on the [[Drudge Report]] with the headline ''"VIDEO: Congressman's town hall erupts over Obama birth certificate ...".''<ref>{{cite web|url=http://www.drudgereport.com|title=DRUDGE REPORT 2011|publisher=Drudgereport.com|access-date=January 4, 2011}}</ref> The story was linked to a tape<ref>{{cite web|url=https://www.youtube.com/watch?v=9V1nmn2zRMc&e |archive-url=https://ghostarchive.org/varchive/youtube/20211212/9V1nmn2zRMc| archive-date=December 12, 2021 |url-status=live|title=Mike Castle on Barack H. Obama Birth certificate|publisher=YouTube|date=June 30, 2009|access-date=January 4, 2011}}{{cbignore}}</ref> documenting a few minutes of the event and hosted on [[YouTube]]. The incident sparked discussion of the topic in relation to the moderate Republican congressman and commentators' surprise at the audience reaction.<ref>{{cite web|url=https://www.msnbc.com/hardball|archive-url=https://web.archive.org/web/20090724043931/http://www.msnbc.msn.com/id/3036697/vp/32056026#32056026|url-status=live|archive-date=July 24, 2009|title=Hardball with Chris Matthews|publisher=MSNBC|access-date=January 4, 2011}}</ref><ref>{{cite web|first=Rick |last=Perlstein |url=http://www.newsweek.com/id/207836|title=Feeling the Wrath of Bill O'Reilly's Army|publisher=Newsweek|date=July 21, 2009|access-date=January 4, 2011}}</ref><ref>{{cite news|url=http://thecaucus.blogs.nytimes.com/2009/07/22/the-early-word-prime-time-night|work=The New York Times|title=The Early Word: Prime-Time Night|first=Bernie|last=Becker|date=July 22, 2009}}</ref> Castle was heckled and booed after calmly responding to a protester, "If you're referring to the President there, he is a citizen of the United States."<ref name="delawareonline1"/>

Reporting in the international press on the explosion of interest in the subject focused on the central role of the Castle incident. The British newspaper ''[[The Guardian]]'' reported:<blockquote>But the real impact has been a video that has garnered hundreds of thousands of hits on the web (in which Congressman) Mike Castle, address(es) a town hall meeting on health care in Delaware last month when a woman suddenly stands up waving a bunch of papers ... The encounter was a warning to Republican officials how far [[Barack Obama citizenship conspiracy theories|the conspiracy theory]] has permeated parts of their party.<ref>{{cite news|url=https://www.theguardian.com/world/2009/jul/28/birther-movement-obama-citizenship|location=London, UK|work=The Guardian|title=Anti-Obama 'birther movement' gathers steam|first=Chris|last=McGreal|date=July 28, 2009}}</ref></blockquote>

==Later political involvement==
Castle was a member of the ReFormers Caucus of [[Issue One]].<ref>{{cite web|url=https://www.issueone.org/reformers |title=ReFormers Caucus |publisher=Issue One |access-date=June 16, 2017}}</ref>

During the [[2016 United States presidential election|2016 presidential election]] Castle endorsed eventual victor [[Donald Trump]] after initially backing [[John Kasich]] during the Republican primaries.<ref>{{cite news|title=Mike Castle is the new Christine O'Donnell?|url=https://whyy.org/articles/mike-castle-is-the-new-christine-odonnell/|newspaper=WHYY|access-date=January 19, 2025}}</ref> In January 2021, Castle criticized Trump for "[antagonizing] people on a pretty regular basis" and described the [[January 6 United States Capitol attack]] as "nonsense".<ref>{{cite web |last1=Robinson |first1=Evan |title=Former Del. Gov. Mike Castle '61 Speaks on Election, U.S. Politics |url=https://www.hamilton.edu/news/story/former-del-gov-mike-castle-election-politics |website=[[Hamilton College]]}}</ref>

==Personal life and death==
On May 23, 1992, Castle married Jane DiSabatino in [[Dover, Delaware]].<ref>{{cite news|url = https://www.newspapers.com/image/158864320/?|title = Newly governed by wedding vows|last = Kesler|first = Nancy|date = May 24, 1992|newspaper = [[The News Journal]]|page = 1|via = [[Newspapers.com]]|url-access = subscription|accessdate = August 14, 2025}}</ref> 

Castle died in [[Greenville, Delaware]], on August 14, 2025, at the age of 86.<ref>{{cite news|url = https://www.delawareonline.com/story/news/2025/08/14/michael-castle-former-delaware-governor-congressman-dies-86/74996880007/|title = For decades, he was Delaware's most popular politician. Mike Castle dies at age 86|last1 = Talorico|first1 = Patricia|last2 = Cormier|first2 = Ryan|date = August 14, 2025|accessdate = August 14, 2025|work = [[The News Journal]]}}</ref><ref name = Lau>{{cite news|url = https://apnews.com/article/mike-castle-dies-delaware-governor-congress-f4ce85249a614c97a041d1981c143fb2|title = Delaware ex-Gov. Mike Castle, who championed 50 State Quarters Program while in Congress, dies at 86|last = Lau|first = Mingson|date = August 14, 2025|accessdate = August 15, 2025|work = [[Associated Press]]|quote = The Delaware Republican Party announced that Castle died Thursday in Greenville}}</ref>

==Electoral history==
{{Election box begin no change |title=1980 Delaware lieutenant gubernatorial election<ref>{{Cite web|url=https://elections.delaware.gov/electionresults/pdfs/1980.pdf|archive-url=https://web.archive.org/web/20160910091607/http://elections.delaware.gov/electionresults/pdfs/1980.pdf|url-status=dead|archive-date=September 10, 2016|title = State Of Delaware Official Result of General Election 1980}}</ref>
}}
{{Election box winning candidate with party link no change
 |party = Republican Party (United States)
 |candidate = Mike Castle
 |votes = 128,827
 |percentage = 58.72
}}
{{Election box candidate with party link no change
 |party = Democratic Party (United States)
 |candidate = Thomas B. Sharp
 |votes = 88,224
 |percentage = 40.21
}}
{{Election box candidate no change
 |party = N/A
 |candidate = Other
 |votes = 2,341
 |percentage = 1.07
}}
{{Election box total no change
  |votes = 219,392
  |percentage = 100.00
}}
{{Election box gain with party link no change
  |winner = Republican Party (United States)
  |loser = Democratic Party (United States)
}}
{{Election box end}}

{{Election box begin no change |title=1984 Delaware gubernatorial election<ref>{{Cite web|url=https://uselectionatlas.org/RESULTS/state.php?f=0&fips=10&off=5&elect=0&year=1984|archiveurl=https://web.archive.org/web/20220827020403/https://uselectionatlas.org/RESULTS/state.php?f=0&fips=10&off=5&elect=0&year=1984|url-status=dead|title=1984 Gubernatorial General Election Results - Delaware|archivedate=August 27, 2022}}</ref>
}}
{{Election box winning candidate with party link no change
 |party = Republican Party (United States)
 |candidate = Mike Castle
 |votes = 135,250
 |percentage = 55.53
}}
{{Election box candidate with party link no change
 |party = Democratic Party (United States)
 |candidate = [[William T. Quillen]]
 |votes = 108,315
 |percentage = 44.47
}}
{{Election box total no change
  |votes = 243,565
  |percentage = 100.00
}}
{{Election box hold with party link no change
 |winner = Republican Party (United States)
}}
{{Election box end}}

{{Election box begin no change | title=1988 Delaware gubernatorial election<ref name=results>{{cite web|title=State of Delaware - Official Election Results 1988|url=https://elections.delaware.gov/electionresults/pdfs/1988.pdf|archive-url=https://web.archive.org/web/20161203125054/http://elections.delaware.gov/electionresults/pdfs/1988.pdf|url-status=dead|archive-date=December 3, 2016|publisher=State of Delaware|access-date=April 19, 2018}}</ref>}}
{{Election box winning candidate with party link no change
  |party = Republican Party (United States)
  |candidate = Mike Castle (incumbent)
  |votes = 169,733
  |percentage = 70.73
}}
{{Election box candidate with party link no change
  |party = Democratic Party (United States)
  |candidate = Jacob Kreshtool
  |votes = 70,236
  |percentage = 29.27
}}
{{Election box total no change
  |votes = 239,969
  |percentage = 100.00
}}
{{Election box hold with party link no change|
  |winner = Republican Party (United States)
  |loser = Democratic Party (United States)
}}
{{Election box end}}

{{Election box begin no change
  | title = Delaware's at-large congressional district election, 1992<ref>{{Cite web|url=https://elections.delaware.gov/electionresults/pdfs/1992.pdf|archive-url=https://web.archive.org/web/20140711184735/http://elections.delaware.gov/electionresults/pdfs/1992.pdf|url-status=dead|archive-date=July 11, 2014|title = State Of Delaware 1992 General Election Results}}</ref>
}}
{{Election box winning candidate with party link no change
  |party = Republican Party (United States) 
  |candidate = Mike Castle
  |votes = 153,037
  |percentage = 55.42
}}
{{Election box candidate with party link no change
  |party = Democratic Party (United States)
  |candidate = [[S.B. Woo]]
  |votes = 117,426
  |percentage = 42.53
}}
{{Election box candidate with party link no change
  |party = Libertarian Party of Delaware
  |candidate = Peggy Schmitt
  |votes = 5,661
  |percentage = 2.05
}}
{{Election box total no change
  |votes = 276,124
  |percentage = 100.00
}}
{{Election box gain with party link without swing
  |winner = Republican Party (United States)
  |loser = Democratic Party (United States)
}}
{{Election box end}}

{{Election box begin no change
  | title = Delaware's at-large congressional district election, 1994<ref>{{Cite web|url=https://elections.delaware.gov/electionresults/pdfs/1994.pdf|archive-url=https://web.archive.org/web/20161203125009/http://elections.delaware.gov/electionresults/pdfs/1994.pdf|url-status=dead|archive-date=December 3, 2016|title = State Of Delaware Official Results 1994}}</ref>
}}
{{Election box winning candidate with party link no change
  |party = Republican Party (United States) 
  |candidate = Mike Castle (incumbent)
  |votes = 137,960
  |percentage = 70.74
}}
{{Election box candidate with party link no change
  |party = Democratic Party (United States)
  |candidate = Carol Ann DeSantis
  |votes = 97,565
  |percentage = 26.56
}}
{{Election box candidate with party link no change
  |party = Libertarian Party of Delaware
  |candidate = Danny Ray Beaver
  |votes = 3,869
  |percentage = 1.98
}}
{{Election box candidate no change
  |party = A Delaware Party
  |candidate = Donald M. Hockmuth
  |votes = 1,405
  |percentage = 0.72
}}
{{Election box total no change
  |votes = 195,037
  |percentage = 100.00
}}
{{Election box hold with party link without swing
  |winner = Republican Party (United States)
}}
{{Election box end}}

{{Election box begin no change
  | title = Delaware's at-large congressional district election, 1996<ref>{{Cite web|url=https://elections.delaware.gov/electionresults/pdfs/1996.pdf|archive-url=https://web.archive.org/web/20150807001232/http://elections.delaware.gov/electionresults/pdfs/1996.pdf|url-status=dead|archive-date=August 7, 2015|title = State Of Delaware 1996 Election Results}}</ref>
}}
{{Election box winning candidate with party link no change
  |party = Republican Party (United States) 
  |candidate = Mike Castle (incumbent)
  |votes = 185,576
  |percentage = 69.55
}}
{{Election box candidate with party link no change
  |party = Democratic Party (United States)
  |candidate = [[Dennis E. Williams]]
  |votes = 73,253
  |percentage = 27.45
}}
{{Election box candidate with party link no change
  |party = Libertarian Party of Delaware
  |candidate = George Jurgensens
  |votes = 4,000
  |percentage = 1.50
}}
{{Election box candidate with party link no change
  |party = Constitution Party (United States)
  |candidate = Felicia Johnson
  |votes = 3,009
  |percentage = 1.13
}}
{{Election box candidate with party link no change
  |party = Natural Law Party (United States)
  |candidate = Bob Mattson
  |votes = 987
  |percentage = 0.37
}}
{{Election box total no change
  |votes = 275,591
  |percentage = 100.00
}}
{{Election box hold with party link without swing
  |winner = Republican Party (United States)
}}
{{Election box end}}

{{Election box begin no change
  | title = Delaware's at-large congressional district election, 1998<ref>{{Cite web|url=https://elections.delaware.gov/archive/elect98/elect98_general/elect98_general_office.shtml|archive-url=https://web.archive.org/web/20080206200735/http://elections.delaware.gov/archive/elect98/elect98_general/elect98_general_office.shtml|url-status=dead|archive-date=February 6, 2008|title = STATE OF DELAWARE GENERAL ELECTION (OFFICIAL RESULTS)}}</ref>
}}
{{Election box winning candidate with party link no change
  |party = Republican Party (United States) 
  |candidate = Mike Castle (incumbent)
  |votes = 119,811
  |percentage = 66.36
}}
{{Election box candidate with party link no change
  |party = Democratic Party (United States)
  |candidate = [[Dennis E. Williams]]
  |votes = 57,446
  |percentage = 31.82
}}
{{Election box candidate with party link no change
  |party = Constitution Party (United States)
  |candidate = James P. Webster
  |votes = 2,411
  |percentage = 1.34
}}
{{Election box candidate with party link no change
  |party = Natural Law Party (United States)
  |candidate = Kim Stanley Bemis
  |votes = 859
  |percentage = 0.48
}}
{{Election box total no change
  |votes = 180,527
  |percentage = 100.00
}}
{{Election box hold with party link without swing
  |winner = Republican Party (United States)
}}
{{Election box end}}

{{Election box begin no change
  | title = Delaware's at-large congressional district election, 2000<ref>{{Cite web|url=https://elections.delaware.gov/archive/elect00/2000genofficial.shtml|archive-url=https://archive.today/20120709023650/http://elections.delaware.gov/archive/elect00/2000genofficial.shtml|url-status=dead|archive-date=July 9, 2012|title = 2000 ELECTION RESULTS STATE OF DELAWARE GENERAL ELECTION (OFFICIAL RESULTS)}}</ref>
}}
{{Election box winning candidate with party link no change
  |party = Republican Party (United States) 
  |candidate = Mike Castle (incumbent)
  |votes = 211,797
  |percentage = 67.64
}}
{{Election box candidate with party link no change
  |party = Democratic Party (United States)
  |candidate = Michael C. Miller
  |votes = 96,488
  |percentage = 30.81
}}
{{Election box candidate with party link no change
  |party = Constitution Party (United States)
  |candidate = James P. Webster
  |votes = 2,490
  |percentage = 0.80
}}
{{Election box candidate with party link no change
  |party = Libertarian Party of Delaware
  |candidate = Kim Stanley Bemis
  |votes = 2,351
  |percentage = 0.75
}}
{{Election box total no change
  |votes = 313,126
  |percentage = 100.00
}}
{{Election box hold with party link without swing
  |winner = Republican Party (United States)
}}
{{Election box end}}

{{Election box begin no change
  | title = Delaware's at-large congressional district election, 2002<ref>{{Cite web|url=https://elections.delaware.gov/archive/elect02/elect02_general/elect02_office.shtml|archive-url=https://web.archive.org/web/20080206200411/http://elections.delaware.gov/archive/elect02/elect02_general/elect02_office.shtml|url-status=dead|archive-date=February 6, 2008|title = 2002 - RESULTS BY OFFICE STATE OF DELAWARE GENERAL ELECTION}}</ref>
}}
{{Election box winning candidate with party link no change
  |party = Republican Party (United States) 
  |candidate = Mike Castle (incumbent)
  |votes = 164,605
  |percentage = 72.24
}}
{{Election box candidate with party link no change
  |party = Democratic Party (United States)
  |candidate = Michael C. Miller
  |votes = 61,011
  |percentage = 26.78
}}
{{Election box candidate with party link no change
  |party = Libertarian Party of Delaware
  |candidate = Brad C. Thomas
  |votes = 2,789
  |percentage = 0.98
}}
{{Election box total no change
  |votes = 227,865
  |percentage = 100.00
}}
{{Election box hold with party link without swing
  |winner = Republican Party (United States)
}}
{{Election box end}}

{{Election box begin no change
  | title = Delaware's at-large congressional district election, 2004<ref>{{Cite web|url=https://elections.delaware.gov/archive/elect04/elect04_general/elect04_general_office.shtml|archive-url=https://web.archive.org/web/20061129125138/http://elections.delaware.gov/archive/elect04/elect04_general/elect04_general_office.shtml|url-status=dead|archive-date=November 29, 2006|title = STATE OF DELAWARE GENERAL ELECTION RESULTS}}</ref>
}}
{{Election box winning candidate with party link no change
  |party = Republican Party (United States) 
  |candidate = Mike Castle (incumbent)
  |votes = 245,808
  |percentage = 69.09
}}
{{Election box candidate with party link no change
  |party = Democratic Party (United States)
  |candidate = Paul Donnelly
  |votes = 105,634
  |percentage = 29.69
}}
{{Election box candidate with party link no change
  |party = Independent Party of Delaware
  |candidate = Maurice J. Barros
  |votes = 2,334
  |percentage = 0.66
}}
{{Election box candidate with party link no change
  |party = Libertarian Party of Delaware 
  |candidate = William E. Morris
  |votes = 2,012
  |percentage = 0.56
}}
{{Election box total no change
  |votes = 355,788
  |percentage = 100.00
}}
{{Election box hold with party link no swing
  |winner = Republican Party (United States)
}}
{{Election box end}}

{{Election box begin no change
  | title = Delaware's at-large congressional district election, 2006<ref>{{Cite web|url=https://elections.delaware.gov/archive/elect06/elect06_general/html/elect06_general_office.shtml|archive-url=https://archive.today/20121205070156/http://elections.delaware.gov/archive/elect06/elect06_general/html/elect06_general_office.shtml|url-status=dead|archive-date=December 5, 2012|title = STATE OF DELAWARE General Election (Official Results)}}</ref>
}}
{{Election box winning candidate with party link no change
  |party = Republican Party (United States) 
  |candidate = Mike Castle (incumbent)
  |votes = 143,897
  |percentage = 57.17
}}
{{Election box candidate with party link no change
  |party = Democratic Party (United States)
  |candidate = Dennis Spivack
  |votes = 97,565
  |percentage = 38.76
}}
{{Election box candidate with party link no change
  |party = Independent Party of Delaware
  |candidate = Karen M. Hartley-Nagle
  |votes = 5,769
  |percentage = 2.29
}}
{{Election box candidate with party link no change
  |party = Green Party (United States)
  |candidate = [[Michael Berg (activist)|Michael Berg]]
  |votes = 4,463
  |percentage = 1.77
}}
{{Election box total no change
  |votes = 251,694
  |percentage = 100.00
}}
{{Election box hold with party link without swing
  |winner = Republican Party (United States)
}}
{{Election box end}}

{{Election box begin no change
  | title     = Delaware's at-large congressional district election, 2008<ref>{{Cite web|url=https://elections.delaware.gov/archive/elect08/elect08_general_election/html/elect08_gen_office.shtml|archive-url=https://web.archive.org/web/20090115215657/http://elections.delaware.gov/archive/elect08/elect08_general_election/html/elect08_gen_office.shtml|url-status=dead|archive-date=January 15, 2009|title = STATE OF DELAWARE General Election (Official Results)}}</ref>
}}
{{Election box winning candidate with party link no change
  |party      = Republican Party (United States)
  |candidate  = Mike Castle (incumbent)
  |votes      = 235,437
  |percentage = 61.08
}}
{{Election box candidate with party link no change
  |party      = Delaware Democratic Party
  |candidate  = Karen Hartley-Nagle
  |votes      = 146,434
  |percentage = 37.99
}}
{{Election box candidate with party link no change
  |party      = Libertarian Party of Delaware
  |candidate  = Mark Parks
  |votes      = 3,586
  |percentage = 0.93
}}
{{Election box total no change
  |votes      = 385,457
  |percentage = 100.00
}}
{{Election box hold with party link without swing
  |winner     = Delaware Republican Party
}}
{{Election box end}}

{{Election box begin no change
 | title      = 2010 Republican primary results for Delaware U.S. Senate<ref>{{Cite web|url=https://elections.delaware.gov/archive/elect10/elect10_Primary/html/election.shtml|archive-url=https://archive.today/20120708205231/http://elections.delaware.gov/archive/elect10/elect10_Primary/html/election.shtml|url-status=dead|archive-date=July 8, 2012|title = STATE OF DELAWARE Primary Election (Official Results)}}</ref>
}}
{{Election box winning candidate with party link no change
 | candidate  = Christine O'Donnell
 | party      = Republican Party (United States)
 | votes      = 30,561
 | percentage = 53.07
}}
{{Election box candidate with party link no change
 | candidate  = Mike Castle
 | party      = Republican Party (United States)
 | votes      = 27,021
 | percentage = 46.93
}}
{{Election box total no change
 | votes      = 57,582
 | percentage = 100.00
}}
{{Election box end}}

==References==
{{Reflist|30em}}

==Sources==
* {{cite book |title=Almanac of American Politics |last=Barone |first=Michael |author2=Richard E. Cohen |publisher=National Journal Group |location=Washington |year=2005 |isbn=0-89234-112-2 |url-access=registration |url=https://archive.org/details/almanacofamerica00mich_5 }}
* {{cite book |title=Governing Delaware |last=Boyer |first=William W.|publisher=University of Delaware Press |location=Newark, Delaware |year=2000 |isbn=1-892142-23-6}}
* {{cite book |title=Democracy in Delaware |last=Hoffecker |first=Carol E. |publisher=Cedar Tree Books |location=Wilmington, Delaware |year=2004 |isbn=1-892142-23-6}}
* {{cite book |title=Memoirs of the Senate |last=Martin |first=Roger A. |publisher=Roger A. Martin |location=Newark, DE |year=1995 }}

== External links ==
{{Wikinews|Tea Party-endorsed Christine O'Donnell wins Delaware Senate primary election}}
* {{CongLinks | congbio=C000243 | votesmart=26792 | fec=H2DE00072 | congress= }}
<!-- Links formerly displayed via the CongLinks template:
* [http://www.govtrack.us/congress/members/400070 Congressional profile] at [[GovTrack]]
* [http://www.opensecrets.org/politicians/summary.php?cid=N00009775 Financial information (federal office)] at [[Center for Responsive Politics|OpenSecrets.org]]
* [http://www.legistorm.com/member/168/Rep_Michael_Newbold_Castle.html Staff salaries, trips and personal finance] at LegiStorm.com
* [http://www.c-spanvideo.org/person/70 Appearances] on [[C-SPAN]] programs
* [http://topics.nytimes.com/top/reference/timestopics/people/c/michael_n_castle/index.html Collected news and commentary] at ''[[The New York Times]]'' -->
* [http://www.russpickett.com/history/delgov5.htm#castle Delaware's Governors]
* [https://web.archive.org/web/20070929111730/http://www.sourcewatch.org/index.php?title=Mike_Castle Profile at SourceWatch]
* [https://web.archive.org/web/20110604072330/http://www.newsmeat.com/campaign_contributions_to_politicians/donor_list.php?candidate_id=H2DE00072&cycle=2006 News Meat]
* {{C-SPAN|70}}

{{s-start}}
{{s-off}}
{{s-bef|before=[[James D. McGinnis]]}}
{{s-ttl|title=[[Lieutenant Governor of Delaware]]|years=1981–1985}}
{{s-aft|after=[[Shien Biau Woo]]}}
|-
{{s-bef|before=[[Pete du Pont]]}}
{{s-ttl|title=[[List of governors of Delaware|Governor of Delaware]]|years=1985–1992}}
{{s-aft|after=[[Dale E. Wolf]]}}
|-
{{s-ppo}}
{{s-bef|before=[[Pete du Pont]]}}
{{s-ttl|title=[[Republican Party (United States)|Republican]] nominee for [[List of governors of Delaware|Governor of Delaware]]|years=[[1984 Delaware gubernatorial election|1984]], [[1988 Delaware gubernatorial election|1988]]}}
{{s-aft|after=Gary Scott}}
|-
{{s-bef|before=[[Thomas Kean]]}}
{{s-ttl|title=Chair of the [[Republican Governors Association]]|years=1987–1988}}
{{s-aft|after=[[Mike Hayden]]}}
|-
{{s-new|office}}
{{s-ttl|title=Chair of the [[Republican Governance Group|Tuesday Group]]|years=1995–2005|alongside=[[Nancy Johnson]], [[Fred Upton]]}}
{{s-aft|after=[[Charles Bass]]<br>[[Mark Kirk]]}}
|-
{{s-par|us-hs}}
{{s-bef|before=[[Tom Carper]]}}
{{s-ttl|title=Member of the [[List of United States representatives from Delaware|U.S. House of Representatives]]<br>from [[Delaware's at-large congressional district]]|years=1993–2011}}
{{s-aft|after=[[John Carney (Delaware politician)|John Carney]]}}
{{s-end}}

{{USRepDE}}
{{Governors of Delaware}}
{{USCongRep-start |congresses=103rd–111th [[United States Congress]]es |state=[[United States congressional delegations from Delaware|Delaware]]}}
{{USCongRep/DE/103}}
{{USCongRep/DE/104}}
{{USCongRep/DE/105}}
{{USCongRep/DE/106}}
{{USCongRep/DE/107}}
{{USCongRep/DE/108}}
{{USCongRep/DE/109}}
{{USCongRep/DE/110}}
{{USCongRep/DE/111}}
{{USCongRep-end}}
{{Authority control}}

{{DEFAULTSORT:Castle, Mike}}
[[Category:1939 births]]
[[Category:2025 deaths]]
[[Category:20th-century members of the Delaware General Assembly]]
[[Category:20th-century United States representatives]]
[[Category:21st-century United States representatives]]
[[Category:21st-century Delaware politicians]]
[[Category:Carroll family]]
[[Category:Delaware lawyers]]
[[Category:Franklin family]]
[[Category:Georgetown University Law Center alumni]]
[[Category:Hamilton College (New York) alumni]]
[[Category:Lieutenant governors of Delaware]]
[[Category:Members of Congress who became lobbyists]]
[[Category:Politicians from Wilmington, Delaware]]
[[Category:Republican Party Delaware state senators]]
[[Category:Republican Party governors of Delaware]]
[[Category:Republican Party members of the Delaware House of Representatives]]
[[Category:Republican Party members of the United States House of Representatives from Delaware]]
[[Category:Tower Hill School alumni]]
[[Category:American people of English descent]]