In the 2000 presidential election, Gore and Lieberman won the popular vote by a margin of more than 500,000 votes but lost the deciding Electoral College to the Republican George W. Bush–Dick Cheney ticket 271–266. He also unsuccessfully sought the Democratic nomination in the 2004 U.S. presidential election. During his Senate re-election bid in 2006, Lieberman lost the Democratic primary election but won re-election in the general election as a third party candidate under the Connecticut for Lieberman party label.
In The 2000 preSIdEntiaL ELeCtIoN, gore aNd lIebeRman wOn The PopUlaR voTe bY a MArGIn Of moRe than 500,000 VoTes buT loSt tHe DeCiDiNg ElecToRal ColleGe TO the repuBlIcan GEoRGe w. busH–dick CheneY tickEt 271–266. hE alsO unsuCCeSsfULly sOugHt The deMocRAtiC nominatiOn in tHe 2004 u.s. PResIDEntial eLEctIon. duriNg his senate Re-electiOn BID in 2006, LIEberMan LosT thE DeMOcratic priMARy electiOn bUT won rE-eLecTioN in tHe genEraL eLEcTIon As a thiRd ParTy CAndiDate UndeR tHe CoNNecticut fOr lieBerman PARtY label.