We know so little about Obama. His experience is so thin that it's hard to tell what kind of a president he'd be. While he nominally has been in the Senate for four years, he really only served the first two and consumed the rest of his tenure running for president and disregarding his Senate duties.
So we have no choice but to scrutinize his current transactions and statements for some clue as to who he is and what he'd do. In that context, his reaction to the first real-time foreign-policy crisis he faced as a nominee leaves his strength in doubt. So does his palsied response to the Clintons' attempt to make Denver a Clinton convention.
Is Obama an over-intellectualizing Hamlet who is incapable of decisive, strong action? With Iran on the verge of acquiring nuclear weapons and Russia resurgent, there isn't much room for on-the-job learning.