Sen. Marco Rubio, R-Fla., speaks at the 40th annual Conservative Political Action Conference in National Harbor, Md., Thursday, March 14, 2013. (AP Photo/Manuel Balce Ceneta)

Associated Press
Sen. Marco Rubio, R-Fla., speaks at the 40th annual Conservative Political Action Conference in National Harbor, Md., Thursday, March 14, 2013.  (AP Photo/Manuel Balce Ceneta)
Sen. Marco Rubio, R-Fla., speaks at the 40th annual Conservative Political Action Conference in National Harbor, Md., Thursday, March 14, 2013. (AP Photo/Manuel Balce Ceneta)
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