Oh yes, and in my youth, the networks as to their national news product were biased left - all three of them. Cronkite specialized in letting you know with his intonations, as to whom he found favor, and with whom he didn't. I actually find less bias today, considerably less, outside those who are not really considered News people, but rather commentators - Matthews, Hannity, O'Reilly, Maddow, etc.
Yes, and there was a rather famous interview with Cronkite from 1973, where was asked, "Is there any truth in the view that television newsmen tend to be left of center?"
Cronkite said: "Well, certainly liberal, and possibly left of center as well. I would have to accept that ... But I don't think there are many who are
far left. I think a little left of center probably is correct."
I think cable has provided a place for people with different ideologies to gravitate.