Political speech versus nude dancing

This post from Ninomania notes once again the incongruity that political speech can be limited but few limits are allowed on nude dancing. The post cites Judge Bork, who as I once quoted here, said much the same thing comparing school prayer and nude dancing. Based on the Fourth Circuit's recent decision in the Charlottesville middle school case, the dancers don't have to be nude, they could wear National Rifle Association t-shirts and still be protected, but the government can stop them from buying ads saying their Congressman is soft on gun control.