United States Senate

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ADVANCE FOR USE MONDAY, APRIL 7 AND THEREAFTER - In this Feb. 20, 2014 photo, former South Dakota Gov. Mike Rounds talks about his candidacy for the U.S. Senate seat being vacated by Sen. Tim Johnson in Sioux Falls, S.D. Rounds will face four opponents in the Republican primary on June 3. (AP Photo/DIrk Lammers)

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Shak Hill is running for a U.S. Senate seat for Virginia. Photo: Shakhill.com

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Midland University president and Republican Senate candidate Ben Sasse is pictured on campus in this photo from June 5, 2013, in Fremont, Neb. The Senate Conservatives Fund, a national conservative group, has endorsed Sasse in Nebraska's U.S. Senate race on Tuesday, Oct. 22, 2013, setting him up as the race's tea party candidate. (AP Photo/Nati Harnik)

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Former Massachusetts Senator Scott Brown is greeted by supporters after announcing plans to form an exploratory committee to enter New Hampshire's U.S. Senate race against Democratic Sen. Jeanne Shaheen,, Friday, March 14, 2014 in Nashua, N.H. (AP Photo/Jim Cole)