At this point Santorum is playing spoiler, and as long as he is in the race, Romney will be the nominee.
If you’re talking about after Florida, yes. For now, he’s helping take down Willard with $1.5 million of SC ads bought and paid for to go with Newt’s $5 mil....
If you’re thinking Santorum’s support would automatically go to Gingrich, I disagree.
I think that support would have gone to/stayed with Gingrich already if voters did not have such great reservations about the potential for Bad Newt to show up.
Santorum has benefitted from being the Not Romney AND the Not Gingrich candidate.