In his address to the 2016 Democratic National Convention, the Rev. Dr. William J. Barber II, then president of the North Carolina Conference of the NAACP and leader of the Moral Mondays Movement, proclaimed, “like our forefathers and foremothers, we are called to be the moral defibrillators of our time.” Likening the pursuit of justice to the regulation of an irregular heartbeat, Barber's words offer a valuable window into the politics of prophetic preaching.