Comedy has been no easier for the phalanx of late-night television hosts who depend on skewering political leaders for a healthy quotient of their nightly monologues. Jay Leno, David Letterman, Conan O’Brien and others have delivered a nightly stream of jokes about the Republican running for president — each one a variant on the same theme: John McCain is old.

But there has been little humor about Mr. Obama: about his age, his speaking ability, his intelligence, his family, his physique. And within a late-night landscape dominated by white hosts, white writers, and overwhelmingly white audiences, there has been almost none about his race.

⇒ Want Obama in a Punch Line? First, Find a Joke (via World on the Web and The Stump.)