...does it take to march on Washington?
estimated... at 1.5 million, but that was unlikely
...in excess of 75,000
50,000 attendees at about 10 a.m.
...approximately 60,000 to 70,000 people flooded Pennsylvania Ave
...25000 to 50000 demonstrators are expected to gather*
(*)Note that this last figure is based on organizers expectations as of September 9th. The idea that they would underestimate their own people by even a factor of five or ten is pretty unlikely.
And 50,000 to 75,000 is what U2 would play at a typical concert.