FILE - In this July 16, 2013 file photo, host David Letterman 

FILE - In this July 16, 2013 file photo, host David Letterman smiles on the set of the “Late Show with David Letterman." A study released Monday of gags made by late-night comics found that Obama and Democrats provided the lion’s share of punchlines during the first six months of the year. That’s an abrupt change from 2012, when Mitt Romney proved a gift to the comic gods. (AP Photo/CBS, John Paul Filo) MANDATORY CREDIT; NO ARVHIVE; NO SALES; FOR NORTH AMERICAN USE ONLY
Associated Press
FILE - In this July 16, 2013 file photo, host David Letterman smiles on the set of the “Late Show with David Letterman." A study released Monday of gags made by late-night comics found that Obama and Democrats provided the lion’s share of punchlines during the first six months of the year. That’s an abrupt change from 2012, when Mitt Romney proved a gift to the comic gods. (AP Photo/CBS, John Paul Filo) MANDATORY CREDIT; NO ARVHIVE; NO SALES; FOR NORTH AMERICAN USE ONLY
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