Because Mr. "Lumbar" is a racist, or something.
And Al "Punk Faggot" Sharpton, of course, is the self-appointed Arbiter of Racist Speech Everywhere. That's A.R.S.E., for short.
BONUS FLASHBACK VIDEO: I predict Obama will have another assignment to East Paraguay in store for Sharpton (and his fellow rabble-rouser Jesse Jackson) ahead of the 2012 election.
h/t Breitbart. Cross-posted.