Huckabee is looking at a very distant 3rd or 4th place finish in Florida (same as Rudy) and although he could win a few southern states on Feb 5th, he will likely run out of money very soon. And by Feb 5 it will be crystal clear he is too far behind in the delegate count to catch up to McCain or Romney.
The Republican race is quickly becoming a 2 person race. Ron Paul has enough money to go on, and could become a third party candidate, but after Feb 5th Huckabee and Rudy won't be able to raise any money, so they will have to drop out no later than Feb 7.