I've found that the "Liberal Media" is usually slightly to the right of moderate. And usually pretty mediocre, coem to that.There seems to be a prevalent myth (actively encouraged by the media) of objectivity. And they are, every now and then., As mentioned, the media has become a market driven force that responds to what the advertisers and/or managers think the readers want to hear/see/read.
"Mother Jones" covered it a few years ago, highlighting stories that weren't carried in national media because the advertisers put in their contracts they type of content to be carried.
Not even a lot of good research goes on. Look at the "Playing Dungeon and Dragons causes suicide" myth. Or the "What Teachers Worry About "Study"" . Both were reported as fact. The later was read into the Congressional Record in support of a bill for educational reform.
Or the story about contemporary slavery in Africa that was/is true but none of the mainstream media would touch it. I heard in on NPR, along with details about how the reporters couldn't get anyone to air the story.
It takes a lot of effort to figure out what's going on. Assuming the media bothers to report it.
Regards
John