Back in 2013, Mancow had actor Harry Lennix on his show. After the show, Mancow apparently had a brief off-air conversation with Lennix, who, upon seeing a picture of Obama in the hallway, told Mancow that he had been hired to train Obama how to speak, "like a South-side, educated, African American Black man from Chicago".
Manco had confided in Alex Jones the story, and somehow Jones bated him onto the air to tell it. You'll have to cue the clip to 6:19. Lennix said he knew Obama since 1992 and went on to call him a "rat-bastard" who "knew he was going to be the President since 1998".
By the 9 minute mark, Mancow is showing a bit of regret, stating that he doesn't want to get Lennix in trouble with the Hollywood/Washington crowd.
https://www.youtube.com/watch?v=VtRfn7tlkrI