Plato, of course, was not clairvoyant. His analysis of how democracy can turn into tyranny is a complex one more keyed toward ancient societies than our own (and contains more wrinkles and eddies than I can summarize here). His disdain for democratic life was fueled in no small part by the fact that a democracy had executed his mentor, Socrates. And he would, I think, have been astonished at how American democracy has been able to thrive with unprecedented stability over the last couple of centuries even as it has brought more and more people into its embrace. It remains, in my view, a miracle of constitutional craftsmanship and cultural resilience. There is no place I would rather live. But it is not immortal, nor should we assume it is immune to the forces that have endangered democracy so many times in human history. ... Part of American democracy’s stability is owed to the fact that the Founding Fathers had read their Plato. ... Many contend, of course, that American democracy is actually in retreat, close to being destroyed by the vastly more unequal economy of the last quarter-century and the ability of the very rich to purchase political influence. This is Bernie Sanders’s core critique. But the past few presidential elections have demonstrated that, in fact, money from the ultrarich has been mostly a dud. ... The evidence suggests that direct democracy, far from being throttled, is actually intensifying its grip on American politics. ... it is precisely because of the great accomplishments of our democracy that we should be vigilant about its specific, unique vulnerability: its susceptibility, in stressful times, to the appeal of a shameless demagogue.