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LITTLE ROCK, AR - NOVEMBER 04: U.S. Rep. Tom Cotton (R-AR) and republican candidate for U.S. Senate in Arkansas waits to greet people entering a polling place on November 4, 2014 in Little Rock, Arkansas. As voters head to the polls, U.S. Rep. Tom Cotton (R-AR) is holding a narrow lead over incumbent U.S. Sen. Mark Pryor (D-AR). (Photo by Justin Sullivan/Getty Images)

LITTLE ROCK, AR - NOVEMBER 04:  U.S. Rep. Tom Cotton (R-AR) and republican candidate for U.S. Senate in Arkansas waits to greet people entering a polling place on November 4, 2014 in Little Rock, Arkansas. As voters head to the polls,  U.S. Rep. Tom Cotton (R-AR) is holding a narrow lead over incumbent U.S. Sen. Mark Pryor (D-AR).  (Photo by Justin Sullivan/Getty Images)