I'll be interested to see the final media estimates of the rally in DC today. CBS estimated that Glenn Beck had 87,000. I have photographs montages from today that I estimate to have more than that, and I'm sure I couldn't see half the crowd.
Given the lack of aerial photographs, and the continuous influx and outflux of people, it must be very difficult to make a solid estimate.... hey wait, maybe this is complexity problem after all. What is the simplest data we could gather to make an estimate? Some combination of photographs and counts of people passing specific points? Hmmmm.... Eric
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