Everyone will be in through super tuesday just because they are on the ballots and the MSM is going to talk about them no matter what.
If he drops out I think it will hurt Ron Paul. How many Giuliani supporters have Ron Paul as their second choice?
If he finishes third or lower in Florida there's no way he's going to win New York, New Jersey or Conneticut. He'll drop out rather than suffer the embarassment of losing in his own back yard.
Recently in interviews he seems to sure of himself.. Wolf Blitzer interviewed him and asked what he would do if he didn't take first in Florida (or something to that extent). Giuliani just smiled and said that he was going to win in FL and then they would move on to the Super Tuesday states. Ha ha. Let's hope he's wrong.