Mark Udall

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Sen. Mark Udall gives his concession speech at the Colorado Democrats' party at the Westin in Denver, Colo., Tuesday, Nov. 4, 2014. (AP Photo/The Colorado Springs Gazette, Jerilee Bennett) MAGAZINES OUT

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Republican candidate Cory Gardner ousts incumbent Democratic Sen. Mark Udall to win the U.S. Senate seat in Colorado.

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rocky road: Colorado Republican Senate candidate U.S. Rep. Cory Gardner has gained on Sen. Mark Udall for his seat.

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Colorado Gov. John Hickenlooper speaks during a rally at which former President Bill Clinton urged Coloradans to reelect Gov. Hickenlooper, U.S. Sen. Mark Udall, and other Democratic candidates, in Lakewood, Colo., Tuesday, Oct. 28, 2014. Clinton held his second rally in two days for embattled Gov. Hickenlooper and Sen. Udall. The former president told a crowd in Lakewood that Colorado symbolizes the future due to its diversity and youth. (AP Photo/Brennan Linsley)

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Rep. Cory Gardner, a Republican seeking a U.S. Senate seat in Colorado, has pulled slightly ahead in polls over his Democratic opponent, Sen. Mark Udall. (Associated Press)

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Shortly before mailing his own ballot, U.S. Senator Mark Udall, D-Colo., speaks inside a coffee shop on a campaign stop to remind voters to mail in their ballots, in the Five Points area of Denver, Monday, Oct. 20, 2014. (AP Photo/Brennan Linsley)

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In Colorado, analyst Stuart Rothenberg shifted the Senate contest's rating from "pure tossup" to "tossup/leans Republican," reflecting a slew of recent polls showing Republican Rep. Cory Gardner running several points ahead of Democratic Sen. Mark Udall. (AP Photo/David Zalubowski)

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U.S. Sen. Mark Udall, Colorado Democrat, went on the attack against election rival Republican Rep. Cory Gardner, claiming that Mr. Gardner "voted for $800 billion in cuts to Medicare that went to tax cuts." (Associated Press)

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Republican challenger U.S. Rep. Cory Gardner makes point during his senatorial debate with incumbent U.S. Sen. Mark Udall, D-Colo., at The Denver Post in Denver on Tuesday, Oct. 7, 2014. (AP Photo/David Zalubowski)

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FILE - In this Sept. 12, 2014 file photo, U.S. Sen. Mark Udall, D-Colo., speaks during a joint news conference with Trout Unlimited by the shore of the St. Vrain Creek, which was disastrously flooded a year earlier, in Lyons, Colo. According to a new poll released Thursday, Sept. 18, 2014, Republican challenger Cory Gardner is leading Udall in Colorado by 8 points. The Quinnipiac University Poll contrasts with two other independent polls released earlier this month that found Udall tied or slightly ahead in the race. (AP Photo/Brennan Linsley, File)

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This combo of file photos shows Rep. Cory Gardner, R-Colo., speaks during an event in Denver in a March 1, 2014, file photo, left, and then Colorado Democratic senatorial candidate Mark Udall in a Oct. 16, 2008, file photo. (AP Photo/Files)

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A recent campaign ad by Democratic Sen. Mark Udall claiming Republican opponent, Cory Gardner, voted to shut down the government as Colorado was cleaning up from a devastating flood has sparked outrage. (Associated Press Photographs)

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Moderator Rachel Richards flips a coin to start the Club 20 Debate as Senator Mark Udall (left) and Rep. Cory Gardner look on. The Udall campaign passed on requests for debates from two Denver TV stations. (Associated Press)

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FILE - In this Jan. 31, 2013, file photo, Sen. Mark Udall, D-Colo., speaks on Capitol Hill in Washington. The Senate race in Colorado has shot toward the top of the nation’s most competitive contests this midterm election year, giving the Democratic incumbent a tougher battle than he expected and Republicans a new pickup opportunity in their drive to win the chamber’s majority. With President Obama highly unpopular in Colorado, Udall is airing an online ad highlighting his criticism of surveillance by the National Security Agency, noting it has occurred under Democratic and Republican administrations. (AP Photo/Susan Walsh, File)