I think people are forgetting the only reason why Leno has a late night comedy show is so he can promote things for people to hopelessly follow. That's why they always have muscians coming on the shows, actors promoting movies, and famous tv show actors promoting their new season of butt **** sitcom only idiots care about.
This is not the kind of show a politician needs to go on, it sends the wrong message. It is sending the message that Obama is a type of media for people to digest and is everything that is wrong with our consumer culture.
Going on Leno isn't serving the American people, it is entertaining us.
As for McCain or Bush going on programs such as these, it is the same deal, politicians are not a form of entertainment. They shouldn't be treated as such, and that is all Leno's show is meant to be, a way to promote new and exciting forms of entertainment to make us feel like our pathetic lives are that much less pathetic.