List of United States senators who switched parties

This list includes United States senators who switched parties while serving in the Senate.

List 19th century NameStateDateCongressOld partyNew partyNotesSouth Dakota189152ndIndependentPopulistNevada189353rdRepublicanSilverRepublicanThe Silver Republicans' seniority and committee assignments were not affected by their having left the party.John P. JonesNevadaSeptember 4, 1894RepublicanSilverRepublicanHenry M. TellerColoradoJune 17, 189654thRepublicanSilverRepublicanLee MantleMontanaRepublicanSilverRepublicanSouth DakotaRepublicanSilverRepublicanUtahRepublicanSilverRepublicanFred DuboisIdaho1896RepublicanSilverRepublicanJames H. KyleSouth Dakota189755thPopulistRepublicanWilliam Morris StewartNevadaDecember 4, 189956thSilverRepublicanRepublican

20th century NameStateDateCongressOld partyNew partyNotesJohn P. JonesNevada190156thSilverRepublicanRepublicanFred DuboisIdahoSilverRepublicanDemocraticDuBois lost his re-election bid in 1896, was again elected as a Silver Republican in 1900, but became a Democrat early in the term.Henry M. TellerColoradoMarch 4, 1901SilverRepublicanDemocraticWashington191363rdRepublicanProgressive191564thProgressiveRepublicanWisconsin193574thRepublicanProgressiveCaucused with the Republicans; briefly returned before losing in 1946.Nebraska193775thRepublicanIndependentMinnesota194076thFarmer–LaborRepublicanOregon195383rdRepublicanIndependentFebruary 17, 195584thIndependentDemocraticSouth CarolinaSeptember 16, 196488thDemocraticRepublicanVirginia197091stDemocraticIndependentKept seniority, but did not caucus with the DemocratsNew York197694thConservativeRepublicanAlabamaNovember 9, 1994103rdDemocraticRepublicanColoradoMarch 3, 1995104thDemocraticRepublicanNew HampshireJuly 13, 1999106thRepublicanTaxpayersAugust 1999TaxpayersIndependentNovember 1, 1999IndependentRepublican

21st century NameStateDateCongressOld partyNew partyNotesVermontJune 6, 2001107thRepublicanIndependentCaucused with the Democrats. Gave Democrats temporary control of the senate.Connecticut2006110thDemocraticIndependentDemocratCaucused with the Democrats. Lieberman was re-elected on the Connecticut for Lieberman ticket; however, he never formally joined that political party.PennsylvaniaApril 28, 2009111thRepublicanDemocraticOriginally a DemocratArizonaDecember 9, 2022117thDemocraticIndependentCaucused with the DemocratsWest VirginiaMay 31, 2024118thDemocraticIndependentCaucused with the Democrats

See also Party switching in the United States List of United States representatives who switched parties Party switching Crossing the floor

References