Not everybody who is not a conservative is a leftist. There are populists (eg Lou Dobbs). There are Libertarians. There is what I call "corporatism" for lack of an accepted word. (I would define "corporatism" as being in favor of government intervention that favors large corporations in general, as opposed to a more laissez-faire conservatism that wants to preserve a free market.) There is socialism (which is distinct from liberalism).
Calling everyone who disagrees with conservative orthodoxy a "leftist" is imprecise and not terribly helpful in defining what you're talking about.
There is a bias in media generally, but I think that it tends towards whatever oddball mix of populism and corporatism will satisfy the undereducated and clueless public while keeping the advertisers and corporate ownership happy.
