United States Senate

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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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Clint Didier, a former Redskins tight end who lost a race for a U.S. Senate seat in 2010, is not tempering his staunch tea party views in his bid for a House seat in Washington state's 4th Congressional district. (Associated Press)

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Republican David Perdue, candidate for U.S. Senate for Georgia (AP Photo/David Goldman, File)

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Democratic candidate for U.S. Senate Michelle Nunn, center, with her daughter Elizabeth, greets early voters after she cast a ballot at Fulton County's Adamsville Recreation Center in Atlanta in this Oct. 15, 2014, file photo. (AP Photo/David Tulis, File)

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Dr. Douglas Butzier, who was running for the U.S. Senate as a libertarian candidate, died Monday night in a plane crash near Dubuque Regional Airport. (KCRG)

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The candidates shake hands before the Fairfax County Chamber of Commerce hosts Virginia's U.S. Senate Debate between Democratic U.S. Sen. Mark Warner, right, and Republican challenger Ed Gillespie on Tuesday, Oct. 7, 2014 in McLean, Va. (AP Photo/The Washington Post, Bill O'Leary, Pool)

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Scott Brown, a former U.S. Senator from Massachusetts, won New Hampshire's Republican U.S. Senate primary on Tuesday. (AP Photo/Jim Cole)

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This combo made from file photos shows New Jersey candidates for U.S. Senate, Republican Jeff Bell, left, and incumbent Democratic Sen. Cory Booker. New Jersey has not elected a Republican to the U.S. Senate since 1972, but conservatives think they have a chance with Bell, a little-known candidate taking on the well-funded Booker. (AP Photo/Mel Evans, J. Scott Applewhite)

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A top Kansas election official ruled Thursday that Democrat Chad Taylor will remain on the ballot for the race for U.S. Senate, despite Mr. Taylor abruptly withdrawing from the election. (Associated Press)

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Democrat Michelle Nunn, center, a U.S. Senate candidate, greets supportes after a candidates forum with Republican nominee David Perdue, Thursday, Aug. 21, 2014, in Macon, Ga. The Georgia race is one of the most closely watched this year as Republicans make a push to take control of the Senate for the last two years of Obama's term. (AP Photo/Atlanta Journal-Constitution, Kent D. Johnson) MARIETTA DAILY OUT; GWINNETT DAILY POST OUT; LOCAL TELEVISION OUT; WXIA-TV OUT; WGCL-TV OUT

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U.S. Senate candidates, Democrat Michelle Nunn, left, and Republican David Perdue, shake hands before their televised candidates forum Thursday, Aug. 21, 2014, in Macon, Ga. The Georgia race is one of the most closely watched this year as Republicans make a push to take control of the Senate for the last two years of Obama's term. (AP Photo/The Macon Telegraph, Woody Marshall)

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Former Illinois Gov. Rod Blagojevich is currently serving a 14-year prison sentence for political corruption — including for seeking to sell or trade an appointment to President Obama's vacated U.S. Senate seat in exchange for campaign contributions or a well-paying job. (Associated Press)

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Dan Sullivan, candidate for the Republican candidate for election to the U.S. Senate, waves signs along a busy street on the morning of Alaska's primary election Tuesday, Aug. 19, 2014, in Anchorage, Alaska. (AP Photo/Becky Bohrer)

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U.S. Senate Majority Whip Dick Durbin acknowledges applause from the crowd of supporters at the Illinois Democratic County Chairmen's Association's annual state fair Governor's Day brunch on Wednesday, Aug. 13, 2014, in Springfield, Ill. (AP Photo/Seth Perlman)

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** FILE ** U.S. Senate candidate and Kentucky Secretary of State Alison Lundergan Grimes, D-Ky., rallies a group of supporters during a campaign stop in Brandenburg, Ky., on Wednesday, July 30, 2014. (AP Photo/David Stephenson)