U.S. Sen. Mark Udall, D-Colo., greets supporters during appearance at a campaign headquarters in northwest Denver suburb of Wheat Ridge, Colo., on Friday, Sept. 5, 2014. (AP Photo/David Zalubowski)
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U.S. Sen. Mark Udall, D-Colo., greets supporters during appearance at a campaign headquarters in northwest Denver suburb of Wheat Ridge, Colo., on Friday, Sept. 5, 2014. (AP Photo/David Zalubowski)
