The Miami Herald reports:
Florida Senator Marco Rubio is about to endorse Republican presidential contender Mitt Romney -- just a week after his political mentor, Jeb Bush, threw in with the party's frontrunner.
Rubio's endorsement is another sign that Romney is viewed as the party's inevitable nominee and that the GOP establishment is growing more concerned with the protacted primary that has dragged down Romney's poll numbers.
Rubio's move is also sure to fuel speculation that he's seeking a spot as a vice-presidential contender. Rubio brings a fresh face, an Hispanic name and electifying speaking style to the campaign trail. Jeb Bush likes him.
UPDATE: Fox News reports:
Romney has "earned this nomination," Rubio said, though he again shot down questions about whether he would accept any offers of a spot on the ticket.
"I don't believe I'm going to be asked to be the vice presidential nominee," he said, adding it's not something he wants.
And here's video: