Obama will not be humiliated. He will have it both ways. If Congress approves, he is vindicated and he will be praised for going to Congress. If he loses, he can take the moral high ground and say he supports humanitarian principles but will defer to the will of Congress and the American people.
The question that should be asked, is if this is so important and urgent, why not call back Congress immediately and get a vote? He is waiting until at least September 9th.
He's waiting until September 9 so he can attack on September 11, or at least have all the headlines on the job that day.
It beats having to face all the hoopla about the "One Year Anniversary of Benghazi". That one will be successfully buried.
Next year by September 11, 2014, his empty "Syria threat" will also be successfully buried.