New York Times film critic Alissa Wilkinson discusses her new book, “We Tell Ourselves Stories: Joan Didion and the American Dream Machine,” which explores the California author’s prescient understanding of how entertainment would colonize American political life. Wilkinson examines Didion’s work through the lens of a Hollywood insider and cultural critic, revealing how she anticipated our drift toward manufactured realities and endless performance — from Ronald Reagan’s performative presidency to modern reality television-style governance.