By 1978, shortly after David Letterman first performed on "The Tonight Show" stage, he had become a regular guest on the show, and would frequently guest-host in Johnny's absence. Needless to say, it was no secret that David was not only one of Johnny's favorite comedians, but also a favorite to replace Johnny when he retired from the show. Watch one of David's earliest performances on the show, here.
In 1980, David was offered his own morning show on NBC, "The David Letterman Show", which garnered him two Emmys in the first year. And since the 1982 debut of "Late Night with David Letterman" he has been a fixture on late-night television. Today, David is the host of "The Late Show with David Lett...
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