--Romney still hasn't won in the south, except in Virginia where Santorum and Gingrich weren't even on the ballot. And there, he won with only 60% of the vote, which means he picked up at most half of the "not Romney vote" in the absence of the two Not Romneys. He is having the same problem in the more rural states of the midwest (OK, ND).
Evangelicals are not voting for him. It's the Mormon thing. I'm telling you, it's the Mormon thing.
--Ron Paul has hit his ceiling. The primaries move to winner-take-all now. What he does with his small, but significant and highly motivated block of voters will be his legacy. We shall see.
--I think either Rick Santorum or Newt Gingrich could still steal the nomination (I'd put it at 3:1) if and only if one of them dropped out and fully supported the other, sometime this week. I'm pretty sure both of their egos will prevent this from happening.