I hate to bring up pigs again -- remember the whole pit bull vs. hockey mom and "lipstick on a pig" fiasco? -- but an old saying needs repeating: Never wrestle with a pig; you both get dirty, but the pig likes it. A variation might be: Don't try to tell jokes with a comedian. You both might get laughs while lapsing into bad taste, but only the comedian will get away with it. That's about all there really is to say about President Obama's Special Olympics joke on The Tonight Show.