Senate
edit| Image | Senator | Party | State | Term in Congress | Term while in party | Notes | Ref. |
|---|---|---|---|---|---|---|---|
| Robert Y. Hayne | Nullifier | South Carolina | March 4, 1823 – December 13, 1832 |
1831 – December 13, 1832 |
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| Dean Barkley | Independence | Minnesota | November 4, 2002 – January 3, 2003 |
November 4, 2002 – January 3, 2003 |
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| Joe Lieberman | Independent | Connecticut | January 3, 1989 – January 3, 2013 |
July 10, 2006 – January 3, 2013 |
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| Bernie Sanders | Independent | Vermont | January 3, 2007 – present |
January 3, 2007 – present |
Elected as an Independent; caucuses with Senate Democrats. | ||
| Joe Manchin | Independent | West Virginia | November 15, 2010 – January 3, 2025 |
May 31, 2024 – January 3, 2025 |
|||
| Angus King | Independent | Maine | January 3, 2013 – present |
January 3, 2013 – present |
Elected as an Independent; caucuses with Senate Democrats. | [1] | |
| Kyrsten Sinema | Independent | Arizona | January 3, 2019 – January 3, 2025 |
December 9, 2022 – January 3, 2025 |
House of Representatives
edit- Elected under third party, but did not serve under party
| Image | Representative | Party | District | Term in Congress | Time while in party | Notes | Ref. |
|---|---|---|---|---|---|---|---|
| Edward Wade | Free Soil | Illinois 15th | March 4, 1853 – March 3, 1861 |
March 4, 1853 – March 3, 1855 |
|||
| Opposition | March 4, 1855 – March 3, 1857 | ||||||
| David P. Holloway | People's | Indiana 5th | March 4, 1855 – March 3, 1857 |
March 4, 1855 – March 3, 1857 |
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| Albert P. Forsythe | Greenback | Illinois 15th | March 4, 1879 – March 3, 1881 |
March 4, 1879 – March 3, 1881 |
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| William Stephens | Progressive | California 10th | March 4, 1911 – July 22, 1916 |
March 4, 1913 – July 22, 1916 |
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| William Kent | Progressive | California 1st | March 4, 1911 – July 22, 1916 |
March 4, 1913 – March 4, 1915 |
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| Independent | March 4, 1915 – March 3, 1917 | ||||||
| John A. Elston | Progressive | California 6th | March 4, 1915 – December 15, 1921 |
March 4, 1915 – March 3, 1917 |
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| Henry S. Benedict | Progressive | California 10th | November 7, 1916 – March 3, 1917 |
N/a | Elected as a Progressive with Republican co-nomination, but served as a Republican during his term. Ran as a Progressive for full term before withdrawing. | ||
| Franck R. Havenner | Progressive | California 4th | January 3, 1937 – January 3, 1941 |
January 3, 1937 – December 30, 1937 |
Elected as a Progressive with Democratic co-nomination, switched parties after election; later served from 1945 to 1953 as a Democrat. | [2] | |
| Dewey Johnson | Farmer–Labor | Minnesota 5th | January 3, 1937 – January 3, 1939 |
January 3, 1937 – January 3, 1939 |
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| John Bernard | Farmer–Labor | Minnesota 8th | January 3, 1937 – January 3, 1939 |
January 3, 1937 – January 3, 1939 |
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| Harold Hagen | Farmer–Labor | Minnesota 9th | January 3, 1943 – January 3, 1955 |
January 3, 1943 – April 15, 1944 |
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| Leo Isacson | Labor | New York 24th | February 17, 1948 – January 3, 1949 |
February 17, 1948 – January 3, 1949 |
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| Franklin D. Roosevelt Jr. | Liberal | New York 20th | May 17, 1949 – January 3, 1955 |
May 17, 1949 – January 3, 1951 |
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| Frazier Reams | Independent | Ohio 9th | January 3, 1951 – January 3, 1955 |
January 3, 1951 – January 3, 1955 |
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| William Carney | Conservative | New York 1st | January 3, 1979 – January 3, 1987 |
January 3, 1979 – October 7, 1985 |
Elected as a Conservative with Republican co-nomination; caucused with House Republicans and joined the Republican Party in 1985. | [3][4] | |
| Bernie Sanders | Independent | Vermont at-large | January 3, 1991 – January 3, 2007 |
January 3, 1991 – January 3, 2007 |
Elected as an Independent; later caucused the House Democrats after previously being barred. | [5] | |
| Jo Ann Emerson | Independent | Missouri 8th | November 5, 1996 – January 22, 2013 |
January 3, 1997 – January 8, 1997 |
Re-elected as an Independent due to state filing laws; caucused with House Republicans and rejoined the party in 1997. | [6] | |
| Virgil Goode | Independent | Virginia 5th | January 3, 1997 – January 3, 2009 |
January 27, 2000 – August 1, 2002 |
[7] | ||
| Justin Amash | Independent | Michigan 3rd | January 3, 2011 – January 3, 2021 |
July 4, 2019 – April 28, 2020 |
[8][9] | ||
| Libertarian | April 28, 2020 – January 3, 2021 | ||||||
| Paul Mitchell | Independent | Michigan 10th | January 3, 2017 – January 3, 2021 |
December 14, 2020 – January 3, 2021 |
[10] | ||
| Kevin Kiley | Independent | California 3rd | January 3, 2023 – present |
March 9, 2026 – present |
Elected Republican in 2022; switched parties in 2026 after California redistricting but continued caucusing with House Republicans. | [11] |
References
edit- ↑ Rama, Padmananda (November 14, 2012). "Maine Independent Angus King To Caucus With Senate Democrats". NPR.
- ↑ "Havenner on Record as Democrat". San Francisco Call-Bulletin. December 30, 1937.
- ↑ McQuinston, John T. (November 9, 1978). "L.I. Conservative a First in House". The New York Times.
- ↑ "Carney Joins G.O.P. Formally". The New York Times. October 9, 1985.
- ↑ Massie, Christopher (June 11, 2015). "Despite Claims, Bernie Sanders Hasn't Always Caucused With Democrats". BuzzFeed News.
- ↑ Dewar, Helen; Yang, John E. (July 13, 1996). "Jo Ann Emerson, Independent?". The Washington Post.
- ↑ Eilperin, Juliet; Hsu, Spencer S. (January 24, 2000). "Va.'s Goode Leaves Democrats to Be an Independent". The Washington Post.
- ↑ Byrd, Haley (July 4, 2019). "Trump critic Justin Amash quits Republican Party". CNN.
- ↑ Alberta, Tim (April 30, 2020). "Justin Amash Wants to Destroy the System that Created Trump". Politico.
- ↑ Cioffi, Chris (December 14, 2020). "Rep. Paul Mitchell leaves GOP, citing 'unacceptable' postelection behavior". Roll Call.
- ↑ Yilek, Caitlin (March 9, 2026). "Rep. Kevin Kiley leaves GOP to become an independent, complicating Johnson's majority". CBS News.