A PBS 'American Masters' documentary investigates the mystique of the elusive 'Tonight Show' host, 20 years after he left TV. Barbara Walters, Peter Jennings and Diane Sawyer all made their best pitch but were turned down. Johnny Carson, the man who changed forever the world of late-night talk, wasn't talking. The network news powerhouses had separately attempted to secure interviews with Carson to get him to speak about his life and his place as one of the most influential figures in TV history. But from his 1992 retirement after 30 years on"The Tonight Show"until his death in 2005 at age...
