“The demagogic spirit of the ‘radio priest’ Father Charles Coughlin and the ‘minister of hate’ Gerald L.K. Smith has been reborn in the candidacy of Donald Trump, just as the exhortations of the Louisiana boss and rabble-rouser Huey Long, who declared war on ‘the superrich’ and proposed a ‘Share Our Wealth Society,’ all but predicted Bernie Sanders’s attack on ‘the billionaire class.'” Examining what political books can tell us about the election season with Sam Tanenhaus at The New York Times.