Keith Olbermann said that the Atlanta Police reported there were about 5000 who showed up. Considering the fact that I can't find any credible news site that is reporting that 15,000 to 20,000 showed up, I would think this to be the truth. If their were huge numbers who turned out anywhere across the country, you can bet Fox would have reveled in reporting it. They haven't. It was a wash out.
If you have a credible, unbiased, and non blog link to the story that 15,000 or more turned out I would be interested in seeing it.