A1LY Plumbing Newswire - CBSThisMorning: A look back at 30 years of David Letterman as a late-night host: http://t.co/SKygvi6K @Late

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CBSThisMorning: A look back at 30 years of David Letterman as a late-night host: http://t.co/SKygvi6K @Late_Show

CBSThisMorning: A look back at 30 years of David Letterman as a late-night host: http://t.co/SKygvi6K @Late_Show

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