In this Oct. 6, 2014 file photo, Sen. Mark Pryor, D-Ark., takes a selfie with former President Bill Clinton at a political rally at the University of Central Arkansas in Conway, Ark. Democrats claimed a triumph after former President Bill Clinton recently campaigned in Arkansas, announcing they had signed up enough partisans to fill 4,000 volunteer shifts through Election Day. Now the concern is the “flake rate” _ the number who fail to show up. Welcome to the final stages of a costly voter turnout operation in Arkansas and other states, which loom as the Democrats’ last line of defense in their effort to keep control of the Senate. (AP Photo/Danny Johnston)
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