While appearing on CNN's Reliable Sources with Howard Kurtz on Sunday, legendary talk show host and comedy writer Dick Cavett praised Jon Stewart and Stephen Colbert's plans to hold a march on Washington, but also offered a little criticism.

Cavett said, "The only thing I might criticize about Jon Stewart's idea is that it's hard for me to remember when he had sanity; in order to restore it, it has to be there."

Cavett was joking, of course, adding, "I think it's a swell idea comedically."

Cavett also defended the controversial appearance of Stephen Colbert before a House sub-committee, which some suggested may have lowered the tone of the hearing. "How do you lower something that's at bottom to begin with?" Cavett said. "It's like saying 'I'm going to lower the tone of Hustler magazine."

No stranger to political controversy himself, Cavett talked about being disliked by President Nixon.

"They [the Nixon Administration] came up with the idea of auditing my entire staff and I didn't find out about it until years later." Despite it all, Cavett did have some kind words for Nixon, "You know, he was a brilliant man, that's the sad thing about him."