I don't expect Obama to fulfill many of his promises. That whole bi-partisanship thing went down the toilet fast when it came to brass tacks.
He never had a platform to run on except "change". I don't think anyone who voted for him challenged that issue and quite frankly, GW screwed things up so badly that they would have voted anyone in on the democratic ticket. And of all the potential candidates (especially Hillary who could have done some serious damage with her socialist ideology), Obama's probably the safest since he's really not going to do anything hopefully.
I just hope he doesn't tax and spend us into oblivion.