He’ll definitely be able to defeat Romney here in Florida if either Ron Paul or the others drop out. The fact that Romney has at most 38% means that there’s more than 60% who don’t want him. But that 60% is very split. In Florida polls, Gingrich has the largest share of it (followed by Paul, then by Santorum and then by Perry).
Ron Paul will never drop out. He knows that he can’t win (not that he’ll say it), but he continues nonetheless. This is either: 1) Pure ego; or 2) he simply wants to draw attention to libertarian ideas.
As for the rest, if Perry and Santorum drop out, then I would bet that 75% of their voters will go for Newt. I think that a Perry withdrawal is in the cards no later than Florida, as I’m sure that he doesn’t want to face a big defeat in his home state.