Bill Clinton’s memoirs are to become the bestselling political book in American publishing history. The 1.5 million copies of the first edition of My Life, which will be published on June 22, have already been accounted for in advance orders, and Clinton’s publishers are racing to print a second impression. The former president’s memoirs will eclipse the 1.8 million copies that his wife Hillary sold of her own memoir, Living History, last year. Clinton began a marathon publicity tour last week, addressing a booksellers’ convention in Chicago. He promised his audience that "If the book’s no good, it’s all my...