Sen. John Thune, of South Dakota, speaks at the South Dakota Republican Convention in Rapid City, S.D., in this June 20, 2014, file photo. (AP Photo/Toby Brusseau, File)
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Sen. John Thune, of South Dakota, speaks at the South Dakota Republican Convention in Rapid City, S.D., in this June 20, 2014, file photo. (AP Photo/Toby Brusseau, File)
