First came Brexit, then came Trump -- and now it’s happening again. In June 2016, Britain voted to leave the European Union. This month, Brexit’s mastermind, Nigel Farage, returned to the fore of British politics. He’s running in next month’s U.K. general election, but Farage’s real aim isn’t to get a seat in Parliament; it’s to replace the Conservative Party with a new populist force of his…