Doesn't this show that while Romney is weak with base Republicans he does very well with moderates and centrists? As long as he can score the nomination the base Republicans don't matter that much, do they? In the general election they're just going to be voting against Obama. Moderate conservatives and the “undecideds,” however, seem much more likely to vote for Romney in the general election which would pose a bigger challenge to Obama than a more conservative candidate.

Would someone please reassure me that Santorum cannot be a viable VP candidate?

Romney can't seal the deal, because no matter how much he wants to be seen as a citizen businessman turned politician, all he has ever been, all he will ever be is a politician. Everything he says and does is superficial, phony, or an out and out lie. The more he talks, and the more people look at him, the more people can see right through him.

Excellent and insightful interpretation of today's results, and the election so far. The voters knew that the polls were non-binding, so they decided to send a message: We aren't enthused with Romney. The fundamental problem is that Romney is a poseur, but not in the way Gingrich is. Newt knows good and well that he's a double-dealing snake, looking to aggrandize himself anyway he can. For Romney, though, that fake-seeming persona is how he really is. He probably doesn't even know that he's doing it, or what everyone is concerned about. “Pretend you're great and you'll be great” seems to have been his personal motto. And that idea (along with millions and millions of dollars) is just what you need to lose an election.  The American people aren't buying it. So despite the desperation of the GOP, Romney will still be the nominee, because he perfectly mirrors the empty “values” (read: “greed”) of today's GOP. Republican voters will be disheartened and fail to turn out. And Obama will coast to re-election (no matter how “close” the media claims the race is).