Also, it's worth mentioning that like any heavily populated urban city, 40 miles is a hell of a lot different from other areas in the world. I don't know if any of you have driven through DC/Baltimore area, but it would take well over 1.5 to 2 hours just to go such a short distance. Traffic is an absolute nightmare there.
I live in that area, and I'd say its just as easy for anyone 40 miles away to go to the Baltimore stadium as it is for anyone from 40 miles in the Boston suburbs to get to Fenway Park, but it is more difficult to drive to the Nationals Park.
Washington, DC continues to be a football town, notwithstanding the fact that they haven't won in two decades and the owner is universally regarded as a gigantic boob.