Sen. Marco Rubio, Florida Republican, arrives for a vote at the Senate chamber on Capitol Hill in Washington on Monday, May 6, 2013. (AP Photo/J. Scott Applewhite)
Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)
Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)
Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)
Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)
Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)
Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)
Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)
Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)
** FILE ** Sen. Marco Rubio, Florida Republican, speaks at the Conservative Political Action Conference at the Gaylord National Hotel in National Harbor, Md., on Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)
Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)
Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)