I really like Santorum, but he would be crucified.
Don't be so sure. The Dems thought that they could destroy Reagan even with their unpopular incumbent President. A lot can change (and often does) in four years. That being said, Obama could end up becoming more popular in four years. Who knows?
I think Santorum better get back into national politics in general if he wants to be president. In any case, I don't really think he is that interested.
I stand by the statement that he would be crucified if nominated.