The International ANSWER coalition organized the Oct. 26 anti-war demonstration. There were between 100,000 and 200,000 in Washington DC, and another 20-80 thousand in San Francisco. That comes to a total of about a quarter of a million people. I was at the DC one, and did my small part to help organize it in the NY branch, and it was very impressive indeed.
VoteNoWar.org is their next effort, leading up to a Peace Congress and another, hopefully larger, demonstration, once more in DC. Please help out - sign it, donate, volunteer with your local organizations, pass it on to all your friends.