If McCain bothers to show up, I wish Lehrer would ask him this exact same question.
UPDATE: Josh Dobbin from the comments:
Holy shit, I forgot how Clinton used to be when he was on top of his game. He zeroes in on that lady and takes her over with a Bela Lugosi hypnotic eye trick. To her, nobody else in the room existed but the two of them, and YET, he was still playing the room AND playing the camera. The guy was the Michael Jordan of political debate.
Now he's like, the Michael Richards.