O'Reilly is a self proclaimed "Independent". Though I have watched him for years, I believe that I have found him to be more Conservative, than Liberal. However, every once in a while he goes off the deep end and I have to change the channel. But I do respect the way that he goes after people, unlike any other host I have seen. He is like a bull and wont let you "spin" your way out of something. Overall, I like the guy.
I'd call him some kind of ersatz "Populist". I am running hot and cold on ol' Mr. Bill.
O'Reilly's idea of being 'independent' is intermittently alternating his attacks on the right and the left. I don't respect his waffling in this sense, but occasionally it can be a lot of fun watching him call people to task on their miscues.