[hans56]

I was at the DC ralley on 4/15. There were alot more than 10,000 under the Washington Monument. I heard numbers from 25,000 to 50,000.
I would guess you need to decide the number like a doctor who asks you how much you drink.
Take the answer and multiply it by 5

[SnuffaBolshevik]

Ed Rendell said 1500.

He’s crazy (or scared). I was there and I’ll bet it was 10K minimum.