As a former economic advisor to President Clinton, he was there to speak on economic issues. As usual, a number of citizens of the Confederate States of America called in to share their...special world view.
Normally, the guests just don't speak to that world view. But this time...
...he actually said something. Even better, he said it correctly. He named everyone, and didn't futz with people's symbols (which was Howard Dean's "pickup truck" error).