Hundreds of homemade signs, an anti war, anti military contingent was there, I don't think they stayed too long.
Two news reports (WLS, WMAQ) put the crowd over 10,000 which is about right. I was there. Dirksen Federal Plaza holds 10,000 - 12,000 people. It was easily 90% full with some overflow onto the street. 10,000 or just over felt about right based on the reports I saw on TV and with my own eyes.
I was there too. Very close to the stage where Mancow was speaking. We were stuffed in there like sardines. I brought my 3 kids and my husband. It was great even though it was cold!