http://www.firstamendmentcenter.org/...-redskins-name
It looks like the Trademarks Office has already been down this path and lost. I would expect the Redskins lawyers to make short work of this. This is an apparent violation of their First Amendment Rights. There's a Stanford Law Review article I'm seeing on Google, it reaches the same conclusion apparently, but I don't want to pay JSTOR any money to read it.