Crooks and Liars has a video of Obama and Bill O'Reilly talking in which Obama says he'll go on his show after the primary.
Obama: There's a whole bunch of people over there I've got to talk to.
O'reilly: Thank you very much, You're a good guy. We like you.
Obama: After the primary we'll go on.
O'Reilly: After New Hampshire.
Obama: After the primary.
After the primary, Obama will go onto Fox News and talk to Republicans on their most hard core red meat show. For now, it's a Democratic primary, and he wants to talk to Democratic voters. Or if you want to be cynical, he doesn't want to make Democrats mad until after the primary.
... adding that it's not a criticism of Obama. O'Reilly is being nice to him, which speaks to how scared the right is. They are bullies and suck up to powerful authority figures. I watch this awesome show called the Dog Whisperer about a dog trainer who helps owners deal with their dogs that often bite other people or act in undisciplined nasty ways. And the Dog Whisperer basically tells them to draw boundaries and be secure in their space, because a dog is asserting dominance when an owner fails to. And he shows them, instantly asserting dominance over the dog and calming him down into a submissive behaved state. That's what Obama did to O'Reilly, who was misbehaving until Obama drew firm boundaries and acted as a more powerful figure.