James Carroll, former Boston Globe columnist, is the author of 20 books, including the new novel The Cloister (Doubleday). His history of the Pentagon, House of War, won the PEN-Galbraith Award. His memoir, An American Requiem, won the National Book Award. He is a Fellow of the American Academy of Arts and Sciences. He lives in Boston with his wife, the writer Alexandra Marshall.
Obama was once a strong voice for nuclear abolition. What happened?