Gallup and Rasmussen both show Romney with a double-digit lead over Santorum nationwide. It’s actually less of a Santorum collapse than a Romney surge.
Many a pundit is pointing out that Romney’s getting all of Virginia’s delegates more or less guarantees his Super Tuesday victory, even if he loses in OH. Larry Sabato among others assumes Romney will surge enough to win OH. It remains the case that Santorum needs a big victory there.
The Santorum swoon and the Romney surge may not be taking place in the South.
So Pete is almost certainly right that the brokered convention now seems impossible, and Romney wins a war of attrition that ends well before the convention.
Observing something doesn’t mean liking it.