Tim Weiner is the author of five books. Legacy of Ashes, his history of the CIA, won the National Book Award. His journalism on secret government programs received the Pulitzer Prize for national reporting. He directs the Carey Institute’s nonfiction residency program and teaches as an Anschutz Distinguished Fellow in American Studies at Princeton. This essay is adapted from his new book, One Man Against the World: The Tragedy of Richard Nixon (Henry Holt and Company).