OblikoMorale, preventing public funds from being spent on stadiums is a state issue, not a Federal one. So there would have to be 50 laws.
Akuperma, I read an article somewhere that attempted to quantify the political beliefs of football fans, and it was more red than blue, but I don’t remember by how much or where I read it. It also said that the NFL is 80% black and the fans are more than 80% white.