What experience or qualities make an effective President?

Thinking sadly about my disappointment with Obama’s effectiveness, even given the rough hand he’s been dealt. Wondering where the inspirational qualities that led me to vote for him have gone. Clinton seemed to have more of the grit and common touch and be more effective – although he certainly had other issues. And there have been more and less effective Republicans.

I’m not looking for this to devolve into a party squabble; really trying to suss out what personal or political qualities a President needs. (LBJ was a bastard but he got good things done.)