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2004 general · November 2, 2004

2004 U.S. Senate election results

Every U.S. Senate race in the 2004 general election, state by state: winners, margins and seats that changed party.

← 2002 general2006 general →

Races34
Changed party7
Unopposed3%1 races

U.S. Senate

D 15 · R 19

RaceWinnerWon byNotes
AlabamaRichard C. Shelby (R)35.2
AlaskaLisa Murkowski (R)3.0
ArizonaJohn McCain (R)56.1
ArkansasBlanche Lincoln (D)11.8
CaliforniaBarbara Boxer (D)19.9
ColoradoKen Salazar (D)4.8Flipped
ConnecticutChristopher Dodd (D)34.2
FloridaMel Martinez (R)1.1Flipped
GeorgiaJohnny Isakson (R)17.9
HawaiiDaniel K. Inouye (D)54.5
IdahoMike Crapo (R)Unopposed
IllinoisBarack Obama (D)42.9Flipped
IndianaEvan Bayh (D)24.4
IowaChuck Grassley (R)42.3
KansasSamuel Brownback (R)41.7
KentuckyJim Bunning (R)1.3
LouisianaDavid Vitter (R)21.7Flipped
MarylandBarbara A. Mikulski (D)31.1
MissouriChristopher Bond (R)13.3
NevadaHarry Reid (D)25.9
New HampshireJudd Gregg (R)32.5
New YorkCharles E. Schumer (D)46.9
North CarolinaRichard Burr (R)4.6Flipped
North DakotaByron Dorgan (D)36.6
OhioGeorge Voinovich (R)27.7
OklahomaTom Coburn (R)11.5
OregonRon Wyden (D)31.6
PennsylvaniaArlen Specter (R)10.6
South CarolinaJim DeMint (R)9.6Flipped
South DakotaJohn Thune (R)1.2Flipped
UtahRobert Bennett (R)40.3
VermontPatrick J. Leahy (D)46.1
WashingtonPatty Murray (D)12.2
WisconsinRussell Feingold (D)11.2

Results are each source's final count; margins are the winner's lead over the runner-up in points of the vote. Source: MIT Election Data and Science Lab