Illinois - a Romney win?

In Illinois, Santorum’s Chance at Nomination Is Slipping Away

 Excerpt:

Illinois had appeared to offer Mr. Santorum a chance at a breakthrough. Instead, unless the polls are very wrong, it may represent a breakthrough of sorts for Mr. Romney – by far his biggest delegate grab and margin of victory in a Midwestern state so far. If Mr. Romney wins Illinois by that margin, it will take the political equivalent of the Bartman ball to cost him the nomination.

Comment: Santorum keeps calling Romney a weak candidate but if that's so he's weaker!