Play of the Day -- Jon Stewart uncovers revealing detail in Obama's Harvard speech

On his show, Colbert spoofs Herman Cain.

The Daily Show on Thursday examines the "radical" footage of President Obama speaking at Harvard. Watch to see as Jon Stewart reports on the curious man who has been following the president since 1990.

And don't miss today's Must See Moment at 2:55 when Stephen Colbert spoofs the artsy attack ad from Herman Cain's PAC.