For example, Fox is uber PRO-GOP, they will only support GOP whenever or whatever their decision. As they are controlled by the Party like you said, HOWEVER, you should also notice that there are 4 Major Media Outlet there are, Fox, CBS, NBC and ABC, with almost equal share of Audience and they all have different Political Different, they will basically attack each other political value, and hence out cannot get out of being complacent and incompetent, because there are ALWAYS another type of media who will go into deep length and doubt your political value, and whichever side you are (GOP or Democrats) there will always be at least half a country doubt what you do at any given time.