“In an era of high polarization, weak parties, and strong partisanship, it’s easy to see how extremists and, more than that, demagogues penetrate the system. America was lucky, if that’s the right word, that Trump proved himself, once in office, distractible, lazy, and uninterested in following through on his most authoritarian rhetoric. He’s done plenty of damage, but he’s not emerged as a dictator in control of American political institutions, as many liberals feared in the direct aftermath of the election. But the world also produces clever, disciplined demagogues. They are the ones who truly threaten republics, and they are watching.”