FILE - In this Oct. 7, 2014 file photo, U.S. Sen. Mark Udall, D-Colo., makes point during senatorial debate with Republican challenger U.S. Rep. Corey Gardner at The Denver Post in Denver. Gardner and Udall have been locked in a months-long, neck-and-neck, battle over a seat that could determine which party controls the U.S. Senate. (AP Photo/David Zalubowski, File)
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