WATCH: Bill O'Reilly on 'The Daily Show' pre-Rumble 2012

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As the nation readies itself for another three weeks of presidential campaign debates, Jon Stewart and and Bill O'Reilly are about to go head-to-head in a verbal sparring contest of their own. The 90-minute "Rumble in the Air Conditioned Auditorium" takes place this Saturday at The George Washington University in Washington, D.C.

Fox News anchor O'Reilly appeared on "The Daily Show" Thursday night to promote his new book, "Killing Kennedy," and to engage Stewart in some pre-Rumble teasing.

"This is what you have in common with the president -- mocking success," O'Reilly said when Stewart downplayed the success of the Fox News anchor's book, "Killing Lincoln."

Stewart got in a few digs at O'Reilly's audience demographics ("the one that won the War of 1812"), but balked at O'Reilly's remark that his next book would be called "Killing Colbert."

"You have stepped over the line, sir," Stewart said. "You are so going down Saturday night."

"I see you as an abominable snowman, all I have to do is get out of your peripheral vision and I should be fine," Stewart added.

You can catch the event live online (for a $4.95 fee) at 8p.m. this Saturday, October 6.

[Via Entertainment Weekly]