It's well worth reading this piece on being black in entertainment/comedy:

I cornered a "Daily Show" writer, doing my best to get the inside track on a possible actor/writer gig. We broached the subject of black correspondents. He told me that they "tried a black guy once, but it didn't work out." I nearly threw my imported beer in his face. Tried it once and it didn't work? You say that about Toyotas, not a whole race of people. But to date, comedy writing is pretty whitewashed. As of this season, "Saturday Night Live" has no black writers. "The Daily Show" also doesn't have any, and neither does "The Colbert Report," a show on which I've played Stephen Colbert's black friend "Alan," a member of the staff. That's right. "The Colbert Report" had to hire an actor to play a black person who works on the show.

[via Oliver Willis]