The rise to the presidency of Barack Obama has posed a problem for comedians, Chris Rock has told CNN. There's little that is funny about him. "He's just one of those guys, you know, like Will Smith. There's no Will Smith jokes. There's no Brad Pitt jokes." Rock says he has yet to get a handle on Obama. "It's like 'Ooh, you're young and virile and you've got a beautiful wife and kids. You're the first African-American president.' You know, what do you say?" But Rock says he's hopeful. "At some point he's going to -- there's always slip ups. No one can survive that level of scrutiny without occasionally making it easy for a comedian."