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INDIANAPOLIS, IN - MAY 29: TV host David Letterman looks on during the IZOD IndyCar Series Indianapolis 500 Mile Race at Indianapolis Motor Speedway on May 29, 2011 in Indianapolis, Indiana. (Photo by Nick Laham/Getty Images)

TV host David Letterman looks on during the IZOD IndyCar Series Indianapolis 500 Mile Race at Indianapolis Motor Speedway on May 29, 2011 in Indianapolis, Indiana. (Photo by Nick Laham/Getty Images)