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2012 U.S. Senate election results

Results of all 33 Senate races in 2012 (seats won: Democratic 23, Republican 8, Independent 2); 5 changed party. Winners, margins and every candidate.

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  • Democratic 23
  • Republican 8
  • Independent 2
AlabamaAlaskaArizona: Jeff Flake REP +3.0ArkansasCalifornia: Dianne Feinstein DEM +25.1ColoradoConnecticut: Christopher S. Murphy DEM +12.5 gainDelaware: Thomas R. Carper DEM +37.5District of ColumbiaFlorida: Bill Nelson DEM +13.0GeorgiaHawaii: Mazie K. Hirono DEM +24.8IdahoIllinoisIndiana: Joe Donnelly DEM +5.8 gainIowaKansasKentuckyLouisianaMaine: Angus S. King Jr. OTH +21.4 gainMaryland: Benjamin L. Cardin DEM +29.7Massachusetts: Elizabeth Ann Warren DEM +7.5 gainMichigan: Debbie Stabenow DEM +20.8Minnesota: Amy Klobuchar DEM +34.7Mississippi: Roger F. Wicker REP +16.6Missouri: Claire McCaskill DEM +15.7Montana: Jon Tester DEM +3.7Nebraska: Deb Fischer REP +15.6 gainNevada: Dean Heller REP +1.2New HampshireNew Jersey: Bob Menendez DEM +19.5New Mexico: Martin Heinrich DEM +5.7New York: Kirsten E. Gillibrand DEM +40.8North CarolinaNorth Dakota: Heidi Heitkamp DEM +0.9Ohio: Sherrod Brown DEM +6.0OklahomaOregonPennsylvania: Robert P. Casey Jr. DEM +9.1Rhode Island: Sheldon Whitehouse DEM +29.9South CarolinaSouth DakotaTennessee: Bob Corker REP +34.5Texas: Ted Cruz REP +15.8Utah: Orrin G. Hatch REP +35.3Vermont: Bernie Sanders IND +46.1Virginia: Timothy Michael Kaine DEM +5.9Washington: Maria Cantwell DEM +20.9West Virginia: Joe Manchin, III DEM +24.1Wisconsin: Tammy Baldwin DEM +5.6Wyoming: John Barrasso REP +52.7Vermont: Bernie Sanders IND +46.1New HampshireMassachusetts: Elizabeth Ann Warren DEM +7.5 gainRhode Island: Sheldon Whitehouse DEM +29.9Connecticut: Christopher S. Murphy DEM +12.5 gainNew Jersey: Bob Menendez DEM +19.5Delaware: Thomas R. Carper DEM +37.5Maryland: Benjamin L. Cardin DEM +29.7District of Columbia
States with a race in 2012, coloured by the winning party and shaded by margin. Grey: no race.

Seats that changed party

All races

StateSeatWinnerPartyMarginBefore
Arizona Class I Jeff Flake Republican 3.0 Republican
California Class I Dianne Feinstein Democratic 25.1 Democratic
Connecticut Class I Christopher S. Murphy Democratic 12.5 Independent flip
Delaware Class I Thomas R. Carper Democratic 37.5 Democratic
Florida Class I Bill Nelson Democratic 13.0 Democratic
Hawaii Class I Mazie K. Hirono Democratic 24.8 Democratic
Indiana Class I Joe Donnelly Democratic 5.8 Republican flip
Maine Class I Angus S. King Jr. Independent 21.4 Republican flip
Maryland Class I Benjamin L. Cardin Democratic 29.7 Democratic
Massachusetts Class I Elizabeth Ann Warren Democratic 7.5 Republican flip
Michigan Class I Debbie Stabenow Democratic 20.8 Democratic
Minnesota Class I Amy Klobuchar Democratic 34.7 Democratic
Mississippi Class I Roger F. Wicker Republican 16.6 Republican
Missouri Class I Claire McCaskill Democratic 15.7 Democratic
Montana Class I Jon Tester Democratic 3.7 Democratic
Nebraska Class I Deb Fischer Republican 15.6 Democratic flip
Nevada Class I Dean Heller Republican 1.2 Republican
New Jersey Class I Bob Menendez Democratic 19.5 Democratic
New Mexico Class I Martin Heinrich Democratic 5.7 Democratic
New York Class I Kirsten E. Gillibrand Democratic 40.8 Democratic
North Dakota Class I Heidi Heitkamp Democratic 0.9 Democratic
Ohio Class I Sherrod Brown Democratic 6.0 Democratic
Pennsylvania Class I Robert P. Casey Jr. Democratic 9.1 Democratic
Rhode Island Class I Sheldon Whitehouse Democratic 29.9 Democratic
Tennessee Class I Bob Corker Republican 34.5 Republican
Texas Class I Ted Cruz Republican 15.8 Republican
Utah Class I Orrin G. Hatch Republican 35.3 Republican
Vermont Class I Bernie Sanders Independent 46.1 Independent
Virginia Class I Timothy Michael Kaine Democratic 5.9 Democratic
Washington Class I Maria Cantwell Democratic 20.9 Democratic
West Virginia Class I Joe Manchin, III Democratic 24.1 Democratic
Wisconsin Class I Tammy Baldwin Democratic 5.6 Democratic
Wyoming Class I John Barrasso Republican 52.7 Republican

Source: FiveThirtyEight election-results; each race page links the official source it was compiled from.