The American left has its own Tea Party, and it’s coming for Donald Trump

Tom MacArthur’s town-hall meeting should have been uneventful. It was May and MacArthur, a Republican congressman, had come home to New Jersey to talk to constituents, having won re-election with a hefty majority less than a year earlier. Normally, at such an event, he might have expected to field a couple of dozen idiosyncratic questions, trot out some polite replies, wrap up after an hour or so, and go home for an easy night’s sleep.