Uh oh, I’ve woken up the dead. The only candidate remaining with the lowest unfavorability ratings is Rick Santorum. Since no one else is willing to step forward, he’s it.
Santorum is a decent enough guy. His conservatism is certainly no more bona fide the Newt's, since they're both "big government conservatives" in their hearts.
Santorum's lower unfavorability rating is most likely directly correlated to his lower recognizability factor. I'm reminded of Peter Lorre asking in Casablanca, "You hate me, don't you, Rick?" To which Rick replied, "If I ever gave it any thought, I probably would."
Should Santorum win in SC and go on to seriously challenge for the nomination, I have no doubt the media would be up to the challenge of making him every bit as unlikeable as Newt.
It's what they do.