It's not at all. They are a huge corporation owned by other corporations, there's no liberal mainstream media, there's sensible center right news, and reactionary hard right news, there are ZERO leftists news stations. Because it costs a ton of money to be a news station and rich people aren't even a little bit leftist.
If you listen to NPR and realize most of their funding was donated by The Koch Brothers, you'll start to notice how often they are on the same talking points as FoxNews and same unchallenged opinions of right wing reactionaries from pundants on most issues. They just deliver it in a smooth and smarmy tone. Again. No one has a media company free of serious financial cost, and no one with money is a leftist.
That's what I've always thought too. Like there's being biased or leaning left or right or whatever... And then there's Fox News. They are so far beyond that it's seriously bordering on satire at this point. They don't lean right, they fucking blasted off into outer space to the right on a rocket ship that's still cruising off into the distance.
They're fairly even keeled but they do still have all the failings of other main stream media. If 1 is left and ten is right (under US focused understanding) I'd probably say they're a 3.5-4.5.
Not talking about any local affiliates. IMO local affiliates tend to be better than national.
I'm not even sure what national ABC is; as far as I've ever seen its local affiliates. Unless we're just talking Disney which I guess is left leaning (that is, if acknowledging gay people existing is left leaning which honestly is kind of sad).
I worked for a local Fox affiliate and, as much as I hated it for other reasons, I can tell you that our journalists and producers were sincere about getting out accurate local reporting.