I’m sure he has loftier ambitions, but if he’s thinking the Presidency, he’s aiming too high. First of all, he’s only been a Democrat for two weeks, so he would have a lot of work to do in order to build a national identity as a Democrat and to win over surrogates or pull Democratic support away from established, lifelong Democrats who might also seek the nomination in 2016.
Plus, he’s only a one-term Governor (elected from a different party) who misjudged his chances at a Senate seat from Florida and sacrificed a second term as Governor to make that bid. If Charlie Crist wants to realize those loftier ambitions, he’s probably going to have to either seek another term as Governor or win a race for the Senate. The Senate would be the best bet for him, but a far tougher race to run than another bid for Governor.