that politicians may be aware of the enormous support they stand to receive from extremist communities when they tap into their ideology. One of the clearest such indicators is the way in which the politicians may subsequently refuse to apologize for their rhetoric or double down with messaging that will appeal to the same communities, even when challenged. We saw it when Trump responded to the deadly, white supremacist Charlottesville rally by saying that there were “very fine people on both sides.” (He later refused to apologize, claiming that the utterance had been put “perfectly.”)