There are two, maybe three, and possibly four.
Upon learning of Stephen Colbert's Letterman-replacement hire by CBS, Rush Limbaugh thundered that the network "has just declared war on the heartland of America."
No longer is comedy going to be a covert assault on traditional, American conservative values [Limbaugh continued]. Now it's just right out in the open. This hire is a redefinition of what is funny, and a redefinition of what is comedy.
As a literary device, irony is best savored by the reader when the soliloquist is altogether oblivious to his ignorance. I would not have conceded this point 10 years ago, before Limbaugh lost all fair expectations of his vileness as mere entertainment, but I'll concede it now: The man has been listening to his own horseshit for so long, he most likely believes it. Hence the infallible irony of a warring-on-America, overt mugger of genuinely conservative values defining what counts as unfunny, political comedy.