What if, midway through, Palin is doing okay, or better than okay? If you're Joe Biden, are you going to just sit there and let her play you to a draw - or beat you? On the biggest stage Biden has ever been on, is he going to let himself get shown up by someone everybody knows is an idiot? Or does Biden get agitated, and start looking for opportunities to attack, to pin Palin down, to put her in her place? If Biden stops playing it safe, all bets are off. He might be brilliant, but things might also go horribly wrong.