What’s so funny about Barack Obama? Apparently not very much, at least not yet. 

On Monday, The New Yorker magazine tried dipping its toe into broad satire involving Senator Obama with a cover image depicting the presumptive Democratic presidential nominee and his wife, Michelle, as fist-bumping, flag-burning, bin Laden-loving terrorists in the Oval Office. The response from both Democrats and Republicans was explosive. 

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. 

“We’re doing jokes about people in his orbit, not really about him,” said Mike Sweeney, the head writer for Mr. O’Brien on “Late Night.” The jokes will come, representatives of the late-night shows said, when Mr. Obama does or says something that defines him — in comedy terms. 

“We’re carrion birds,” said Jon Stewart, host of “The Daily Show” on the Comedy Central channel. “We’re sitting up there saying ‘Does he seem weak? Is he dehydrated yet? Let’s attack.’” 

But so far, no true punch lines have landed. 

Why? The reason cited by most of those involved in the shows is that a fundamental factor is so far missing in Mr. Obama: There is no comedic “take” on him, nothing easy to turn to for an easy laugh, like allegations of Bill Clinton’s womanizing, or President Bush’s goofy bumbling or Al Gore’s robotic persona. 

“The thing is, he’s not buffoonish in any way,” said Mike Barry, who started writing political jokes for Johnny Carson’s monologues in the waning days of the Johnson administration and has lambasted every presidential candidate since, most recently for Mr. Letterman. “He’s not a comical figure,” Mr. Barry said. 

Jokes have been made about what Senator Hillary Rodham Clinton really thought about Mr. Obama during the primaries, and about the vulgar comments the Rev. Jesse Jackson made about him last week. But anything approaching a joke about Mr. Obama himself has fallen flat. 

When Mr. Stewart on “The Daily Show” recently tried to joke about Mr. Obama changing his position on campaign financing, for instance, he met with such obvious resistance from the audience, he said, “You know, you’re allowed to laugh at him.” Mr. Stewart said in a telephone interview on Monday, “People have a tendency to react as far as their ideology allows them.” 

Want Obama In A Punch Line? First, Find A Joke