Written by: Beck

Time for the political analysis of Mark Shields and David Brooks.

Shields: Iraq defines this election.

Brooks (paraphrased): The number of radicals participating in that march was striking. I don't know how much people can choose who they march with, but I know I wouldn't feel comfortable participating in a march that had a large contingent of fascists, for example. I think people seeing people like Michael Moore and others in that march will cause something of a backlash.

Shields: Giuliani was the closest thing we had in America to Winston Churchill after 9/11... John McCain holds a unique position in American politics. He's the only person to have lost an election and gone on to shape the next election. Both parties wanted him for a running mate.

McCain will be interviewed by Lehrer and company at the end of tonight's events.