You think Richard Nixon's presidency was the worst scandal ever? Well, so far, anyway. It all started with a tape holding a door open at the Watergate complex in Washington, D.C., discovered by a security guard 39 years ago on June 17, 1972. That discovery started a sinister chapter in America's history, fueled by the fervent investigative work of Bob Woodward and Carl Bernstein of The Washington Post and ending with the president, Richard M. Nixon, exiting the White House in disgrace on August 9, 1974. A similar Watergate scandal could erupt for Barack Obama. The only difference is that...