The 'baggers wildly overestimated the crowd at their D.C. weekend protest, augmenting the lies with a phony photograph. More here, including a widely quoted observation about the claim by Freedom Works, the Dick Armey lobby that has spent huge sums developing the teabag protests, that more than a million attended.
The way this false estimate came into being is relatively simple: Matt Kibbe, the president of FreedomWorks, lied, claiming that ABC News had reported numbers of between 1.0 and 1.5 million when they never did anything of the sort. A few tweets later, the numbers had been exaggerated still further to 2 million. Kibbe wasn’t “in error”, as Malkin gently puts it [in her update to her 9/12 tea party post]. He lied. He did the equivalent of telling people that his penis is 53 inches long.