Rumble, live on the Web: Bill O'Reilly (The O'Reilly Factor) and Jon Stewart (The Daily Show) go at it tonight in a mock political debate being touted as "The Rumble in the Air-Conditioned Auditorium." It'll cost you to watch the event online, though. (And one has to ask, why didn't they televise it, anyway?) Beginning at 8 p.m. and sold out at George Washington University in Washington, you can watch for $4.95, streamed live or downloaded later at therumble2012.com. The money goes to Stewart and O'Reilly, who say they'll give half their net profits to charity.