Debate Liveblog IV: The Final Countdown

Just a reminder that Michael Grunwald, Karen Tumulty and I will liveblogging tonight's final Presidential debate at the usual location, currently occupied by a threatening-looking countdown clock. Whenever I look at it, I have an urge to decide whether to cut the green wire or the yellow wire.

Your predictions about the questions, strategies and Hail Mary passes are welcome. In particular, John McCain would seem to be in a bind, having all but promised yesterday to bring up William Ayers at the debate, only to wake up to the headline, Poll Says McCain Hurts His Bid by Using Attacks. Does he stage a surprise niceness attack? And what does Barack Obama do, besides kneel with the ball and wait for the clock to run out? (I know, a sports analogy! I watched a football game once!)