Finally got an explanation of the bottom photo. It was taken around 8:30AM or earlier, because by 9AM they'd shut off the lawns on the side of the reflecting pool and hauled in fences and porta potties.
So it's as I said - different times of day. Apples to oranges. The only folks in the bottom photo are the ones that camped on the mall overnight.
On that note, the Associated Press is
saying Beck's was a bit larger.
Congratulations! you win!
(And then the Stewart/Colbert rally at the end of the month will put them both to shame.)