Remember when D.C. Mayor Adrian Fenty said he was expecting 4 million people to show up for Inauguration Day, but some federal officials retorted that his number was way too high? Well today the Post reports that estimates appear to be being revised to more like 2 million — which is still way, way more than the 400,000 or so who attended the 2005 inauguration of President Bush, but at least it doesn’t quite put the fear of God into everyone. The story does a good job of keeping track of the wildly varying numbers and explaining why those numbers are all so different: most officials admit that they just don’t have any models from which they can base their plans.