That is the word on the street, but we won't know for sure until Romney's VP selection is officially announced. Time's Mark Halperin and Katy Steinmetz have more:

In the GOP Veepstakes, commentators are focusing for now on Florida Senate phenom Marco Rubio as a potential vice-presidential prospect ... Meanwhile, real pros are gaming out a more relevant question: How can Romney's team turn Ohio Senator Rob Portman into a "surprise" selection after months of insider consensus that he is the inevitable and smartest pick?