Here is an interesting discussion about the financing of the media machine that has benefited the right end of the political spectrum over the last decade.
I have always chafed at the term "liberal media." It is most often used when the media reports a fact that the Right does not like or digs beneath the veneer of political spin. Since it is hard to debunk facts, they tend to blame the messenger as biased, thus avoiding having to talk about the facts. In effect this changes the topic and sends the hounds chasing a different fox. The media then has to justify doing their job with integrity. In effect I feel "liberal media" is a low blow.