Here is how I would rate some of the Fox News hosts:
Beck - Constitutionalist which makes him a mostly full on libertarian and I guess way on the right. Probably what most Americans would be if they did as much reading as he does.
Hannity - Full blown Republican somewhere between a socialist and a constitutionalist. Probably more married to the party than to a true set of immovable ideals like Beck.
O'reilly - Probably your typical moderate east coaster. Probably a little to a lot left of center for the US as a whole. Would have been a Democrat 40 years ago.
I personally think Fox leans a bit to the left overall. I think they are probably fairly moderate compared to the US as a whole which is where the money is. That is why their ratings blow the other news channels out of the water.
Here is how I would rate some of the Fox News hosts:
Beck - Recursive Assclown
Hannity - Moralizing Neanderthal
O'reilly - Paternalistic Dip****