From an old interview with Stephen Colbert at the Onion A.V. Club:
[T]he character can be tough, because it’s hard for me to maintain the level of self-assurance that someone like O’Reilly has all the time. He was so admirable in a way when he was on Letterman, because he really was kind of unflappable. He was bigger than any venue he’s in. And that’s a hard thing to achieve. I’d love to be able to believe that for short periods of time. I’m afraid if I did that completely well, I’d never be able to turn it off. How great would it be to feel that great about yourself?
Seriously, I am still fucking giddy about this. He will be number one on the Pretend Boyfriend list for a very, very long time.

