Jake Tapper of ABC has this photo, via Twitter.
It's the usual gathering of suspects: Code Pinko, International ANSWER, Veterans for Peace (aka Geezers for Sitting on Their Hands) and Iraq Veterans (who didn't serve there) Against The War. Many of these groups are fronts for Communist groups who have agitated on behalf of Islamic governments.
My friends at FreeRepublic.com are there as well. I'm hoping to have more photos, etc as I can find them later.
UPDATE: From the Washington ComPost, dozens were arrested, including traitor Daniel Ellsberg, the leaker behind the "Pentagon Papers" leak.
Screenshots from videos found on YouTube: