Political polarization, inequality, and corruption during the period 146 to 78 BC gravely weakened the Roman Republic in the years before its collapse. In his new book “The Storm Before the Storm: The Beginning of the End of the Late Republic,” podcaster Mike Duncan explores this period and how Rome’s politics, which emerged from Rome’s success, subsequently led to the republic’s downfall. Benjamin Wittes interviewed Duncan on his new book to discuss ancient and modern populisms, the parallels between the late Roman Republic and current American politics, and the impact of demagoguery on government.