Never mind. I found it. Wicepedia
2004 confrontation with Comedy Central's Jon Stewart
One of Carlson's most memorable appearances on Crossfire was his heated exchange with Jon Stewart, host of The Daily Show, prior to the 2004 presidential election. Stewart criticized the format of shows like Crossfire, calling Carlson and co-host Paul Begala "partisan hacks," and asked them to "stop hurting America."
Carlson countered by criticizing Stewart's July 2004 interview with then U.S. Presidential candidate John Kerry. He accused Stewart of "sniffing Kerry's throne" and "not asking tough questions." Stewart replied "I didn't realize that [...] the news organizations look to Comedy Central for their cues on integrity." After Carlson told Stewart "I think you're more fun on your show," Stewart replied by saying: "You know what's interesting though? You're as big a dick on your show as you are on any show."[3]
After their televised confrontation, Carlson recalls, Stewart "stayed at CNN several hours after the show to discuss the issues that he raised on the air." "He (Stewart) needed to do this," Carlson said.[4]
In January 2005, CNN announced they were ending their relationship with Carlson and would soon cancel Crossfire as a direct result of the Stewart interview.[5] CNN chief Jonathan Klein told Carlson on January 4, 2005, that the network had decided not to renew his contract.[6] Carlson, however, claims he had already resigned from CNN and Crossfire long before Stewart was booked as a guest, telling host Patricia Duff: "I resigned from Crossfire in April, many months before Jon Stewart came on our show, because I didn't like the partisanship, and I thought in some ways it was kind of a pointless conversation... each side coming out, you know, [raises fists] 'Here's my argument,' and no one listening to anyone else. [CNN] was a frustrating place to work."[7]