Behavioral economists have established that people often make decisions that run counter to their best interests. Sometimes we disregard the long term; sometimes we do not see what is in front of us. In his new book Why Nudge? Cass Sunstein argues for a new form of paternalism in government, one that protects citizens against serious errors or damage, but also recognizes the risk of overreaching and restricting freedom of choice. Sunstein speaks with Peter Beinart, another public intellectual who is deeply suspicious of wisdom received from self-perpetuating government systems.