Colbert's character 

Saying his character is mocking right-wing pundits is fine, but there is no source to say he is specifically imitating Hannity or O'Reilly.  True, a couple sources do point out similarities, but what exactly makes these (highly opinionated) sources authorities on the specific people who Colbert is supposedly imitating?  Colbert mentions that Hannity and O'Reilly are "over-the-top" as far as personality driven opinions go, but he doesn't say that's who he's imitating.  Besides, he doesn't even say them exclusively, he says "someone LIKE Hannity or O'Reilly".

His own words don't suffice here, and a source pointing out similarities and asserting in a totally non-objective (try putting "Bill O'Reilly's bullying media-age demagoguery" into the article and see what you get) way is not enough to include the comparison.   (Karwynn)