Unfair and Unbalanced

And you may ask yourself,
"Well, how did I get here?"
--Talking Heads

Pew study finds that the media generally does not agree with the 'fair and balanced' approach to journalism. While more than three quarters of adults believe all sides of an issue deserve equal coverage, only 55% of journalists do.

Political ideology moderates belief in 'bothsidesism.' Approximately 70% of journalists indicated that they worked for outlets that lean left. 

Unfortunately, the survey did not ask respondents how they themselves leaned politically--or at least it was not reported. However, adults indicating affinity for the left were less likely to endorse 'bothsidesism.'

In a nod toward their increasingly progressive higher ed training grounds, younger journalists appear less likely to strive toward balanced coverage than older journalists.

It would be interesting to see some longitudinal data here. Has this sort of slant been on the increase? Or is it the same as it ever was?