When will Donald Trump’s supporters finally peel off? Liberals are now hoping his campaign’s apparent collusion with Russia in last year’s election will do the trick. But many Trump voters are more than just voters. They are political fans — a poorly understood modern phenomenon. Political fans reason a lot like sports or music fans, explains Cornel Sandvoss, professor of media and journalism at the UK’s Huddersfield University.

Political fandom isn’t entirely new. Margaret Thatcher had her fan base and, in 1994, Silvio Berlusconi in Italy created a party, Forza Italia, named after a football supporters’ chant. His candidates even wore Italy’s blue football shirts.

But social media gave political fandom a lift. Now supporters have spaces to express themselves, away from old po-faced wannabe-neutral political media. Partisans gather on social media to root for their candidate in a debate, almost as if it were a boxing match. Elections look ever more like sporting spectacles. No wonder that during last autumn’s US presidential “horse race”, viewing figures for gridiron’s National Football League fell: many fans had found a new sport. Trump, who is steeped in American sports, understands the crossover with politics. Recall the video he tweeted in which he appears as a wrestler pummelling the CNN logo.