My apologies if this subject has already been posted. I watched the events unfold last night, but found one thing very odd. How do a thousand people materialize on the Washingto Mall late at night, simultaneous with the president's speech, all of them roughly in their late 20's and early 30's, many holding Obama campaign signs? I've been to the Washington Mall, and it is not exactly party-central late Sunday night. From Georgetown maybe ? Very curious.