Ed Kilgore believes "the Invisible Primary of elite opinion" has already voted against Romney:
Romney is going to be operating without a net once the campaign is under way. With the entire political world impatiently waiting for his inevitable demise so that the "real" campaign can get under way, every mistake the man makes is going to get exaggerated in the hope that he will see the light and stop taking up space.
Jonathan Bernstein isn't so sure:
Is all this speculation about Romney's weakness simply outsiders thinking through the logical case against him, perhaps prodded a bit by spin from rival candidates and general ambivalence from serious GOP players? Or is it — as was almost certainly the case with Palin-bashing — part of a serious effort by anti-Romney Republicans to veto him?