well, hes paralyzed. he has been trying to play catch up with the red line marker he laid down way back.
He announced yes we are attacking then what we'll do, now we'll wait. He spent a week winding this up, now, it will be seen overseas as a balk, and well, its a sign of indecisiveness and weakness. He seems to speak without considering the power of his words cum promises. If he wanted to wait for a coalition to form then he should have before making declarative statements. Kerry too.
Just a note that he doesn't need congresses approval to strike, hes got 60 days.