Since Fox has been the number one rated news network for many many years, I guess when you say main stream media you must be referring to Fox News?
Here’s some news for you, right from a Fox Senior Vice President:

“An increasing number of viewers are relying on Fox News for both news and opinion,” Fox News Senior VP Michael Clemente said in the statement, “and the average news consumer can certainly distinguish between the A-section of the newspaper and the editorial page, which is what our programming represents.

“So with all due respect to anyone who might still be confused about the difference between news reporting and vibrant opinion, my suggestion would be to talk about the stories and the facts rather than the attack the messenger . . . which over time has never worked.”