DENVER -- Sen. Barack Obama's campaign organized its supporters Wednesday night to confront Tribune-owned WGN-AM in Chicago for having a critic of the Illinois Democrat on its air. (Listen to the interview.) "WGN radio is giving right-wing hatchet man Stanley Kurtz a forum to air his baseless, fear-mongering terrorist smears," Obama's campaign wrote in an e-mail to supporters. "He's currently scheduled to spend a solid two-hour block from 9:00 to 11:00 p.m. pushing lies, distortions, and manipulations about Barack and University of Illinois professor William Ayers." Kurtz, a conservative writer, recently wrote an article for the National Review that looked at Obama's ties to Ayers, a former 1960s radical who later emerged as a school reform advocate in Chicago. The magazine had been blocked in its initial attempts to obtain records from the University of Illinois at Chicago regarding a school reform initiative called the Chicago Annenberg Challenge, which Obama chaired and Ayers co-founded. Obama critics were quick to suggest that political clout could be involved in seeking to protect Obama from embarrassment. The school later reserved its position and made the records available Tuesday. On Wednesday evening, Obama's campaign urged supporters to call the radio station to complain. "Tell WGN that by providing Kurtz with airtime, they are legitimizing baseless attacks from a smear-merchant and lowering the standards of political discourse," the note said. "It is absolutely unacceptable that WGN would give a slimy character assassin like Kurtz time for his divisive, destructive ranting on our public airwaves," the note continued. "At the very least, they should offer sane, honest rebuttal to every one of Kurtz's lies." Zack Christenson, executive producer of "Extension 720 with Milt Rosenburg," said the response was strong. "I would say this is the biggest response we've ever got from a campaign or a candidate," he said. "This is really unprecedented with the show, the way that people are flooding the calls and our email boxes." Christenson said the Obama campaign was asked to have someone appear on the show and declined the request. ------------------------------------- From WGN-AM: Listen to the interview with Stanley Kurtz. "He got into the files just yesterday, so we wanted to have him on to find out what he found. And, if at all possible, we wanted to get the Obama campaign, to get their side of the story," Christenson said. "That's why the uproar is kind of amazing, because we wanted the Obama campaign's take as well." The show's producer said the calls dropped off after the show's first hour. He did not have a count of calls, but said it was "non-stop." Obama's campaign has launched similar offensives against stations that have run campaign ads that it did not like.