Hopefully, The Messiah has been coached to imitate Plugs Biden, making faces, gesturing, head-shaking, laughing, etc., and make a complete ass of himself ALSO (just as Plugs did). This would appeal to his dufus-base, and blacks who think Whitey is the enemy and condescending.
Even with pre-planted Obamabots in the Town Hall farce, Romney can, once-again, appear "Presidential", and cite PAST PERFORMANCE and destroy Obama on that basis, alone. He just has to keep his cool, and point out the false accusations as they are couched in the questions.
I have never seen a man more able to keep his cool than Mitt.