New Stephen Colbert Super PAC Ad: 'Vote for Herman Cain'

ABC News' Jonathan Karl reports:

A new Stephen Colbert Super PAC ad was just released, encouraging South Carolinians to vote for Herman Cain in Saturday's primary:  "He's such an outsider, he is not even running for president."

It must be said, however, the Herman Cain in this ad looks an awful lot like … Stephen Colbert.

Watch the ad here.