It seems he didn't know whom was Prof. Peterson and who was Ben Jealous. Jealous, at least, has some notoriety.
I'd understand if a name was confused, or forgotten, or misspoke, but not this. It came off as Prof. Peterson was just one of those two black guys sitting on that side of the roundtable.
...whatever....
Schieffer is, of course, an LBJ Texas Democrat at heart....