(By Ken Hughes, a historian at the University of Virginia's Miller Center of Public Affairs) On all 2,636 hours of secretly recorded Nixon White House tapes that the government has declassified to date, you can hear the president of the United States order precisely one break-in. It wasn’t Watergate, but it does expose the roots of the cover-up that ultimately brought down Richard Milhous Nixon. Investigation of its origin reveals almost as much about the president’s rise as his fall.