The phone rang and it was Ross Perot, who hasn't given an interview in years. Perot, who won 19 percent of the vote in the 1992 presidential election, making him one of the strongest third-party candidates in American history, got straight to the point. "Remember what you wrote about John McCain in the March 13, 2000, NEWSWEEK?" "Sure," I lied. "When McCain called Perot 'nuttier than a fruitcake'?" The Texas billionaire, now 77, still has some scores to settle from the Vietnam era, and his timing is exquisite. Just days before the South Carolina GOP primary, he wants me to...