A gap-toothed sardonic TV host with a flair for improvisation, David Letterman has taken a place as one of the kings of late night television. While he was once seen as the heir apparent to Johnny Carson at NBC (where he spent much of the 1980s as writer and host of "Late Night with David Letterman"), the Indiana native surprisingly wasn't tapped to replace Carson when he retired. A bit peeved,…
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