U.S. Sen. Marco Rubio, R-Fla., speaks during Iowa Gov. Terry Branstad's annual birthday fundraiser, Saturday, Nov. 17, 2012, in Altoona, Iowa. (AP Photo/Charlie Neibergall)

Associated Press
U.S. Sen. Marco Rubio, R-Fla., speaks during Iowa Gov. Terry Branstad's annual birthday fundraiser, Saturday, Nov. 17, 2012, in Altoona, Iowa. (AP Photo/Charlie Neibergall)
U.S. Sen. Marco Rubio, R-Fla., speaks during Iowa Gov. Terry Branstad's annual birthday fundraiser, Saturday, Nov. 17, 2012, in Altoona, Iowa. (AP Photo/Charlie Neibergall)
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