The Glenn Beck rally at the Lincoln Memorial seems to have generated considerable debate... about how many people were there. 87,000... 500,000... 1,000,000? Depends on who is doing the estimating. Crowds in a defined area are often difficult to estimate because of the "density factor." How many people per square feet actual versus possible.
Here is my best guess... 250,000 using the Michigan Stadium metric... how many Michigan Stadiums full of people. Using Google Maps with the satellite view at the same scale, you can see that the Rally area was somewhat larger than two full Michigan Stadiums.
Simple as that.
