Just saw the crowd shots on the news. Staggering stuff, I'd never have bought into this beforehand. I was in downtown noon-ish, taking a walk with my dad who is trying to bounce back from pulling a muscle in his back. We saw lots of people but the news showed much bigger crowds.
At the same time it was a little sad to see the news footage from the 'support the troops' rallies. It was a little bit too noticeable that the cameramen had to stay within 5 yards to get a screen full of people. Say, between 5 and 20 or so...
I don't pretend to know what the ratio of supporters to protesters is, but it seems obvious that the ratio of marchers is very heavily skewed towards protesting.