Anderson Cooper's Vile Joke

Crack CNN anchor Anderson Cooper made a funny joke about the tax protest "Tea Parties" going on today. I laffed and laffed when I heard it. It was as funny as... a "your mother is a whore" joke? No, that's not it. A joke about people dying of horrible diseases? No, that's offensive, everybody knows that. A joke about concentration camp cuisine? No, same deal. A joke that depends on simple irony? Hmmm. Could be.