Mitt Romney will stump with Sen. Marco Rubio (R-Fla.) in Pennsylvania on Monday, an appearance that is sure to fuel speculation that Rubio is on Romney’s short list for vice president.

Rubio has been touted by many for the vice presidential slot, as a Cuban American who is beloved by the Tea Party. But he has repeatedly denied any interest in the position, and while endorsed Romney about a month ago he so far has stopped short of full-throated praise.

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