Here's a hint, David Letterman: An apology starts with you admitting you were totally wrong ... no equivocation ... no explanation ... no rationalization, and ends with you expressing your sorrow, giving a promise that it won't happen again and offering an act of contrition (such as your resignation or self-imposed suspension) ... no smirking ... no laughing ... period.
The Browns might want to pass that advice along to Farah. It took seven years for Farah and WND to admit to publishing false claims about a supporter of Al Gore after it became clear that it would lose the libel lawsuit the supporter filed against WND, which was about to go to trial. And even then, at no point in the official statement does WND offer any "act of contrition" amid the legalese. Farah and WND also wimped out by refusing to disclose the settlement terms of the lawsuit.
The Browns, meanwhile, make the false claim that Letterman was "joking about the rape of Palin's 14-year-old at the hands of a professional baseball player." Letterman says that wasn't his intention, and the Browns can't prove otherwise.
The Browns might want to apply that apology advice to themselves and apologize to Letterman for making a claim it can't substantiate.