Why ABC TV Chicago Did the Blagojevich Chicago Mob Bookmaker Story: Robert Cooley's Credibility

Why did ABC TV Chicago do 4 stories concerning allegations that Rod Blagojevich was a bookmaker for the Chicago Mob , years ago, paying a street tax to operate? Elizabeth Bracket in her book on Blago quotes ABC TV Chicago Chuck Goudie (page 56):

So, was Rod Blagojevich a small time bookie in 1985? Chuck Goudie of WLS-TV says, "Well, this is one of those situations where I wasn't there. I'm depending on a federal witness named Cooley, whom they put their trust in with federal cases that resulted in lots of people going to jail. If I wasn't comfortable with what Cooley said being true, I wouldn't have put it on the air."

Here's the story ABC TV Chicago did on the FBI confirming they were told of Blago bookmaking allegations, over 20 years ago.