If It's Sunday, It's .... Who?

(AP)
You don’t think Bill Cosby. (For the 3,000 broadcast, by the way. Thanks, FishbowlDC) And you really don’t think Stephen Colbert.
And yet, there was Bill Cosby this past Sunday – along with Harvard Medical School Professor Alvin Poussaint, M.D. – discussing his new book and America’s ongoing discussion of race for the entire hour.
Then it was reported that Stephen Colbert will be appearing this week to discuss, this writer presumes, his new book as well as his decision to enter the South Carolina presidential primaries – in both parties.
What gives?
Ex-NBA ref Tim Donaghy