Marco Rubio has only been in the U.S. Senate for a year and a half, but there's a lot of speculation that the Tea Party favorite could be Mitt Romney's runni...
Q&A: Marco Rubio
Marco Rubio: A GOP rising star
Senator Marco Rubio
Marco Rubio's State of the Union Response
Senator Marco Rubio's R.N.C. Speech - Elections 2012
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