Karen Tumulty, political columnist for The Washington Post, discusses her forthcoming book, "The Triumph of Nancy Reagan," which draws on archives, letters, memoirs, White House records, and four years of interviews with people close to the Reagans to reveal new details of the multifaceted character of the First Lady. Eileen McNamara, Pulitzer Prize-winning former Boston Globe columnist and Brandeis professor of the practice of journalism, moderates.