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Republican George Allen conceded the tightly contested Virginia Senate race to Democratic challenger Tim Kaine Tuesday night.
The two former governors vied for the seat Democratic Sen. Jim Webb vacated after one term.
With 88 percent of the vote in, Kaine led Allen with 50.6 percent of the vote, or by about 37,000 votes.
The victory denies Republicans an open seat they targeted for more than a year in hopes of ending Democratic Senate rule.
For Allen, it was a bitter second loss for the same seat, and one that leaves his once-bright political future in doubt. Allen held the seat from 2001 to 2007, losing re-election to Webb in a 2006 campaign marred by Allen's use of the slur "macaca" aimed at a Virginia-born Webb campaign aide of Indian descent.
Kaine, a former Democratic National Committee chairman, depicted Allen as a bare-knuckled GOP partisan hostile toward bipartisan compromise.
Kaine said Wednesday he believes Democrats and Republicans will come together to avoid the "fiscal cliff."
In an appearance on NBC's "Today" show, Kaine said voters sent a message to Washington that they want "cooperative government." But he also said the election results show that the public doesn't want "all the levers in one party's hands" on Capitol Hill.
Kaine won not only traditional Democratic strongholds like Richmond and Fairfax County but also historically Republican-leaning Loudoun and Prince William counties.
The Senator-elect said what happened Election Day was no fluke - Virginia is no longer a red state. It is a battleground state key to the nation's political future.
The Associated Press contributed to this story.