In 1968, a racist, populist presidential candidate held a hate-filled rally at Madison Square Garden. It sounded a lot like Trump’s. “You feel you have all known this somewhere. Never again will you read about Berlin in the ’30s without remembering this wild confrontation here of two irrational forces. The American sickness has finally been localized.” These words were written about a noxious political rally that took place shortly before a presidential election at New York City’s Madison