SACRAMENTO -- Larry Berman, a political science professor at the University of California at Davis, is in the middle of a hectic publicity schedule for the launch of his new book, "Perfect Spy: The Incredible Double Life of Pham Xuan An."An, who died in 2006, was a longtime spy for the Communist Party in Vietnam and is credited with playing a major role in Vietnam's victory over the United States. A gifted conversationalist, An worked for Time magazine in Vietnam, befriending many of the era's leading journalists. But before that, he went to college in California and had a brief...