Behind the scenes of ‘Late Show with David Letterman’

Bob Sirott and Marianne Murciano
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As David Letterman prepares to wrap up his late-night run, show announcer Alan Kalter reminisces about his 20 years behind the microphone. He tells Bob and Marianne why he took the job, how it evolved into an on-camera role and whether that’s really Letterman running across the stage.

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