Going to go for Santorum.
He is a complete Christian blow-hard, but at least he is honest on that fact, and you got to respect that. Obviously not like or endorse, but the blunt, albeit misguided, honesty, is a change.
Romney changes his opinion to suit whomever he is courting. He was a moderate conservative, but has gone hardline to appeal to the tea party infested base.
…oh and Romney will win, and the Democrats should be able to then blow a hole through an infighting GOP. Thing is, the Dems have a habit of shooting both their feet off through being ineffectual , so nothing is guaranteed.