It is the ultimate Washington story, told by the ultimate Washington chronicler. But in Washington and just about everywhere else, sales of "The Secret Man," Bob Woodward's story of the source known as Deep Throat, have been underwhelming. At Politics and Prose, a well-known independent bookstore in Washington, sales were "not very good, compared to expectations," said Mark LaFramboise, who ordered 400 copies of the book for the store. As of last week, Politics and Prose had sold "60-something," he said. "I expected it to be a blockbuster," he said. "I was wrong." At Prairie Lights Books in Iowa City,...