Romney

Romney barely pulls off winning Ohio, and loses several states to Rick Santorum, thus losing the news cycle and extending the "narrative" that he is unable to sell himself to conservative voters.

I think the most interesting thing going on isn't which of these guys Republican voters are going to choose...it's that these are the choices they've come to. Two entirely uninspiring, career politicians who "look" the part rather than act the part. Santorum is a hardcore evangelical way out of the mainstream, and Romney is just not good at politics...he's a Biden-level gaffe machine. For voters who seem hell bent on getting a basically moderate president out of office, they're not exactly sending their best troops to the front lines.