Sad to say, of the three candidates, I think Santorum is most likely to lose delegates, because he was not very organized when he had no money and no support.
Then there was the Gingrich campaign co-chair in Tennessee who switched to Santorum on Saturday, and then was elected as a Gingrich delegate. I believe Tennessee is also a “morally bound” state, and I’m betting the guy will vote for Gingrich as he was elected to do, but you never know.
In MI they changed the rules after the primary to give Romney that extra delegate. If their boy is still Romney, I can see them appropriating Santorum’s unbound delegates to get Mitt over the top. We’ll see.