File - In this Aug. 25, 2014 file photo Republican Arkansas U.S. Senate candidate Tom Cotton, right, speaks in Little Rock, Ark., after being endorsed by Arkansas Gov. Mike Huckabee, left, in his race against Democratic Sen. Mark Pryor. Arkansas voters have been bombarded with political ads for the state's Senate race that started more than a year ago when Republicans identified the race as a possible key to winning control of the Senate. (AP Photo/Danny Johnston, File)
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