United States Senate

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FILE - In this May 24, 2012 file photo, Texas Republican candidate for the U.S. Senate Craig James gestures during a press conference in Houston. James says Fox Sports hit him with a "sucker punch" _ inviting him to join a regional college football show, then firing him and telling the media he was too polarizing for TV. The longtime broadcaster and SMU star has accused Fox of discriminating against him due to his views opposing gay marriage, which he stated during a failed campaign two years ago for U.S. Senate. (AP Photo/Pat Sullivan, File)

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U.S. Rep. Steve Daines, R-Mont., right, joined by his wife, Cindy, uses his smartphone to electronically file his candidacy for Montana's open U.S. Senate seat in Bozeman, Mont., on Monday, Feb. 24, 2014. (AP Photo/Bozeman Daily Chronicle, Adrian Sanchez-Gonzalez)

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U.S. Rep. Steve Daines, R-Mont., left, joined by his wife, Cindy, right, speaks to the press after filing his candidacy for Montana's open U.S. Senate seat in Bozeman, Mont., on Monday, Feb. 24, 2014. (AP Photo/Bozeman Daily Chronicle, Adrian Sanchez-Gonzalez)

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U.S. Rep. Steve Daines, R-Mont. speaks to the press after filing his candidacy for Montana's open U.S. Senate seat in Bozeman, Mont., on Monday, Feb. 24, 2014. (AP Photo/Bozeman Daily Chronicle, Adrian Sanchez-Gonzalez)

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** FILE ** Matt Bevin, Republican candidate for U.S. Senate, speaks to a gathering at the Spencer County GOP Lincoln Day Dinner on Friday, Feb. 7, 2014, in Fisherville, Ky. Bevin is running against Mitch McConnell R-Ky. (AP Photo/Timothy D. Easley)

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Sen. John Walsh, D-Mont., left, accompanied by his wife Janet, shakes hands with Vice President Joe Biden after a ceremonial swearing-in ceremony to the U.S. Senate, Tuesday, Feb. 11, 2014, on Capitol Hill in Washington. (AP Photo/Lauren Victoria Burke)

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Rick Weiland, the Democratic candidate for one of South Dakota's two U.S. Senate seats, talks about the Medicare Choice Act he plans to introduce if elected, Tuesday, Feb. 4, 2014, in Sioux Falls, S.D. (AP Photo/Dirk Lammers)