The billionaire Koch brothers have been running feel-good, folksy image ads about their company, Koch Industries, the nation’s second largest privately held corporation, on liberal outlets, particularly MSNBC and now on Jon Stewart’s “The Daily Show,” on Comedy Central.

Stewart fired back with a parody of the brothers’ ad on his show this week. “Clearly,” Stewart said, “the Koch brothers are trying to say to our audience of not yet dying-off voters: ‘Even though you may have heard certain things about the Koch brothers, how bad could they be? I mean, if they were evil, would a baby agree to appear in one of their advertisements?’”