240,
Rudy being Pro-Choice, against the right to own a gun, and Pro-gay marriage, he never really had a chance in the early States, such as South Carolina, and Iowa. So his only chance was hoping that come Florida, their was not a true front runner, then he could win Florida, then go on to super Tuesday with a win.
Also Rudy and McCain basically share a few of the same voters, ( not the true conservatives ) more moderate, and with McCain getting a few wins early, many of the Rudy backers switched to McCain
Some people said it was a bad plan, but the truth is, it was his only plan, as South Carolina and Iowa would have never gone his way (with Rudy being pro-choice, and against the right to own a gun )