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DENVER, CO - NOVEMBER 04: U.S. Sen. Mark Udall (D-CO) addresses guests at a Democratic Party election night event at the Westin Denver Downtown Hotel on November 4, 2014 in Denver, Colorado. Udall was defeated by challenger U.S. Rep. Cory Gardner (R-CO). (Photo by Doug Pensinger/Getty Images)

DENVER, CO - NOVEMBER 04:  U.S. Sen. Mark Udall (D-CO) addresses guests at a Democratic Party election night event at the Westin Denver Downtown Hotel on November 4, 2014 in Denver, Colorado. Udall was defeated by challenger U.S. Rep. Cory Gardner (R-CO).  (Photo by Doug Pensinger/Getty Images)