Watergate burglar G. Gordon Liddy, who left prison for a successful career as a conservative radio commentator, is retiring after 20 years and revealing two of the secrets that made him so famous so fast. Liddy, who stopped broadcasting on Radio America July 27 and has since switched off his microphone for good, told Secrets that his radio career began over 20 years ago when he was asked to fill in for a vacationing talk show host in the New York area. On the first day he arrived with a cold and his voice failed him. Down the hall, conservative...