Transcript for Colbert's PAC Ad: 'Mitt the Ripper'
There's a super pac supporting you in South Carolina they released the new -- Overnight taking a very tough shot I haven't been I had not seen -- -- Corporations. America's greatest institution. They built this country one job at a time. Mitt Romney says he's for corporations. Corporations are people my friend. But Mitt Romney. As his -- As head of Bain Capital he bought companies carved them -- and -- really what he couldn't use. Did Mitt Romney really believe these corporations are people my friend. And Mitt Romney. It's a serial. -- -- If you believe corporations are people do your duty and protect them. On Saturday January 21 stop at the -- before he kills again. Americans for better tomorrow tomorrow are responsible for the content of this after. Mitt Romney a serial killer -- Powerful stuff that's how does not cross the line. Firewood I had nothing to do with that -- I have no control over that that if anything and that ad. Is inaccurate. If he did not say corporations are people and if he did not make his money -- -- -- -- former Keller I am not calling anybody a serial killer I can't tell. Americans for a better tomorrow tomorrow what to do it's not my super -- George it's those super pack of I hope I'm pronouncing these correctly John Stu -- I believe it's a -- Well listen if that's not accurate I hope they take it down -- I don't know I don't know if Mitt Romney -- serial killer that's a question he's gonna have to answer but I know one thing that sounds like. -- superstar actor John Lithgow voicing that and he played a serial killer on Dexter. Two points -- a line.
This transcript has been automatically generated and may not be 100% accurate.