CHICAGO -- Chicago's media gossip columnists are abuzz with news about Illinois' new political sensation, U.S. Senator-elect Barack Obama. Friday night, Obama will be featured on "Late Show" with David Letterman. CBS released a portion of tonight's transcript, and the Chicago Tribune's Maureen Ryan teased readers this morning by publishing part of the interview which will air Friday night at 10:30 PM CST: Letterman: " . . . Now was there a guy running for Senate, maybe an incumbent, maybe not, I think a Republican, and he had a problem because he and his wife would go to strip clubs...