William F. Buckley, Jr., and Norman Mailer were the two towering intellectual figures of the 1960s, and they lived remarkably parallel lives. Both became best-selling authors in their twenties (with God and Man at Yale and The Naked and the Dead); both started hugely influential papers (National Review and the Village Voice); both ran for mayor of New York City; both were noted for their exceptional wit and venom; and both became the figurehead...