Republican presidential front-runner Mitt Romney picked up a coveted endorsement from Sen. Marco Rubio of Florida, a rising GOP star often discussed as a possible vice presidential candidate.
"I am going to endorse Mitt Romeny," Rubio said on Fox News Channel's Hannity show. "Not only is he going to be the Republican nominee, he offers a stark contrast to this president's record."
He later added, "I will work very hard for Mitt Romney as the nominee of our party."
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