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)

Photo by: J. Scott Applewhite

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)