In the late 1980s and early 1990s, a white supremacist became an American political phenomenon. David Duke’s rise to power and prominence—his election to the Louisiana legislature, and then his campaigns for the U.S. Senate and the governorship—was an existential crisis for the state and the nation. The fourth season of Slate’s Slow Burn will explore how a Nazi sympathizer and former Klansman fashioned himself into a mainstream figure, and why some voters came to embrace his message. It will also examine how activists, journalists, and ordinary citizens confronted Duke’s candidacy, and what...