My sarcasm meter deflected when I read Monkeyleg's post. I think he was poking at the myriad folks (Sharpton, among others. Hard to believe, no?) that have been calling the Restoring Honor rally racist because it was held on the anniversary of MLK's speech.
From what I have read, Beck claims the date was chosen randomly, and that he didn't realize the significance until later. Of course, I'm not sure I believe that claim, either.