The Dems will now try to drag this thing out.
Let them. Their members are anxious to get home. The longer they are in DC, the more time for GOP challengers to attack, attack, attack.
A central thesis to the McCain candidacy is that he can get things accomplished across bipartisan lines. Essentially he is assuming the mantle of presidential leadership.
Another point: McCain has gotten inside BO's head and rattled him again. BO has done all this cramming on foreign policy for Friday, perhaps for naught. Additionally, the global economic implications of foreign policy are now guaranteed to enter the Friday debate, which further escalates BO's learning curve. He's cramming for an exam for which McCain is continuing to raise the stakes.