To Mark Robinson, gay and transgender people are “filth”, homosexuality is an abominable sin, and the transgender movement is “demonic” and “full of the spirit of the antichrist”. Muslim Americans, meanwhile, are invaders, and Robinson is not afraid to dabble in antisemitism: in his mind an international cabal of Jewish financiers make up a modern-day “four horsemen of the apocalypse”, who rule the banks in “every single country”. Lots of people have offensive and conspiracy-minded beliefs. But not all of them are running, as Robinson is, to be governor of North Carolina. And to people who don’t share Robinson’s views,...