Well, it means he has to pander to the corporate interests of the Party, not necessarily the God-guns-and-gays elements of the party. He has an inherent advantage with the corporatists already.
But yeah, he can't pivot too soon back to the middle (and there are signs he's already in mid-pivot) or he risks a voter backlash among the far-right Republicans, especially if a guy like Santorum or Tancredo runs a third-party bid.
There's a fine art to becoming a centrist after having spent months trying to out-conservative the conservatives, and I feel like Romney doesn't have that level of smoothness. Waiting on a "I voted for it beofre I voted against it" moment.
FWIW, I think Gov. Nikki Haley in SC would be an incredibly shrewd choice (even if she's already said she'd turn it down). The primaries have absolutely KILLED the GOP's numbers with women. Putting up a woman for VP stems the bleeding, and enables them to say "Look, we're more progressive than the Dems! We have an ethnic minority female on our ticket, and they just have another old white guy."
As alluded to there, she's an Indian-American (of Punjabi Sikh parentage), and for the GOP she's the best kind of ethnic:
the one that can be easily mistaken for white at a casual glance.
She identifies as both Sikh and Methodist (don't ask me how you pull that one off), so the religion thing could be sidestepped (and if the Dems really start to poke at that, it makes them come off poorly for insinuating there's something wrong with religious minorities).
She's relatively young for a major pol (38), physically attractive, a native Southerner, married to a career military man, and is seen as a rising star in the GOP. In a lot of ways, she's everything Mitt Romney isn't, and so enables them to push the ticket as much more inclusive.
But....as I said to start with, she's already on record as saying she'd turn it down. People have a way of changing their mind when the fruit is actually dangled in front of them, but it's an instant hit to her credibility if she takes the job now.
That said, I really doubt that Biden will run in 2016.
Who the hell is Joe Biden?
He's Ed McMahon to Obama's Johnny Carson. Although it just dawned on me, you don't even see them together that often.