United States Senate

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FILE - This Oct. 15, 2013 file photo shows Dan Sullivan announcing a U.S. Senate bid in Anchorage, Alaska. Sullivan recently commented on raising the minimum wage. (AP Photo/Mark Thiessen, file)

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Scott Brown leads GOP hopefuls for a U.S. Senate seat from New Hampshire in a primary match-up, according to a new survey. (SCOTTBROWN.COM)

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U.S. Senate candidate Matt Bevin speaks at a meet and greet, Tuesday Jan. 14, 2014 in Henderson, Ky. The Louisville businessman is running against Senate Republican Leader Mitch McConnell in Kentucky's GOP primary next May. (AP Photo/The Gleaner, Mike Lawrence)

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Democratic U.S. Senate candidate Terry Adams, a Knoxville attorney, introduces himself at a press conference in Nashville, Tenn., on Friday, Jan. 10, 2014. (AP Photo/Erik Schelzig)

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Democratic U.S. Senate candidate Terry Adams, a Knoxville attorney, introduces himself at a press conference in Nashville, Tenn., on Friday, Jan. 10, 2014. (AP Photo/Erik Schelzig)

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Democratic U.S. Senate candidate Terry Adams, a Knoxville attorney, introduces himself at a press conference in Nashville, Tenn., on Friday, Jan. 10, 2014. (AP Photo/Erik Schelzig)

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Former Alaska Gov. Sarah Palin speaks at a rally for U.S. Senate candidate Steve Lonegan in New Egypt, N.J., on Saturday, Oct. 12, 2013. (AP Photo/Julio Cortez)