The politics professor Matthew Goodwin made an interesting observation on Twitter this week. He pointed out that many of the characteristics of the ‘paranoid style’ in American politics — a phrase coined by Richard Hofstadter to describe right-wing populists such as Barry Goldwater — apply to left-wing anti-Brexit campaigners. They are convinced that the 2016 referendum result was due to the machinations of sinister data-mining companies, Kremlin bot factories and Vladimir Putin.