Senate

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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
Dean Barkley Independence Minnesota November 4, 2002 –
January 3, 2003
November 4, 2002 –
January 3, 2003
Joe Lieberman Independent Connecticut January 3, 1989 –
January 3, 2013
July 10, 2006 –
January 3, 2013
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

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  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
Albert P. Forsythe Greenback Illinois 15th March 4, 1879 –
March 3, 1881
March 4, 1879 –
March 3, 1881
William Stephens Progressive California 10th March 4, 1911 –
July 22, 1916
March 4, 1913 –
July 22, 1916
William Kent Progressive California 1st March 4, 1911 –
July 22, 1916
March 4, 1913 –
March 4, 1915
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
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
John Bernard Farmer–Labor Minnesota 8th January 3, 1937 –
January 3, 1939
January 3, 1937 –
January 3, 1939
Harold Hagen Farmer–Labor Minnesota 9th January 3, 1943 –
January 3, 1955
January 3, 1943 –
April 15, 1944
Leo Isacson Labor New York 24th February 17, 1948 –
January 3, 1949
February 17, 1948 –
January 3, 1949
Franklin D. Roosevelt Jr. Liberal New York 20th May 17, 1949 –
January 3, 1955
May 17, 1949 –
January 3, 1951
Frazier Reams Independent Ohio 9th January 3, 1951 –
January 3, 1955
January 3, 1951 –
January 3, 1955
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

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