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UNITED STATES - NOVEMBER 1: Sen. Mark Pryor, D-Ark., right, canvasses a Little Rock, Ark., neighborhood in an effort to drum up votes in his tight race race against Republican challenger Tom Cotton on Saturday, Nov. 1, 2014. (Photo By Bill Clark/CQ Roll Call)

UNITED STATES - NOVEMBER 1: Sen. Mark Pryor, D-Ark., right, canvasses a Little Rock, Ark., neighborhood in an effort to drum up votes in his tight race race against Republican challenger Tom Cotton on Saturday, Nov. 1, 2014. (Photo By Bill Clark/CQ Roll Call)

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