United States Senate

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Milton Wolf, a Republican candidate for the U.S. Senate in Kansas, speaking to a Tea Party Express rally in Wichita, Kansas, on Sunday, April 27. Photo by Judson Phillips

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Rep. Tom Cotton, Arkansas Republican is running for the U.S. Senate seat now held by U.S. Sen. Mark Pryor, a Democrat. (Associated Press)

T.W. Shannon — seen here with his family — has garnered strong support from Ted Cruz, Mike Lee and Sarah Palin in his quest for the U.S. Senate seat in Oklahoma; he is shown here with his family. (T.W. Shannon)

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In this Wednesday, April 16, 2014 photo, Sen. Kay Hagan, D-N.C., listens during an appearance in Durham, N.C. Hagan has tried for her first 5 1/2 years in the U.S. Senate to persuade North Carolina voters that being in the middle of the road is a good thing. (AP Photo/Gerry Broome)