Here's a video from the DC Iraq protest: link. It appears to have featured even more of a (if I may use the phrase) wacko contingent than the protest that I attended, and those were in Los Angeles. Includes a dirty hippie on a pogo stick, another one with an accordion, an older dirty hippie making unintelligible sounds, a group called HIPS (link) leading a chant, and... folk songs!

Another one is here. There are pictures here.