he can expect a lot of name-calling from the virtuous

If you're a black Democrat politician who switches sides to the GOP, you can expect to be treated as an apostate by your ex-fellow Dems. They might not put out a death fatwa on you, but rest assured they'll call you all the names that they claim are racist when certain unreconstructed rightie bigots use them. Because hypocrisy means nothing to these fuckers.