The MSM has made lying the norm. They refuse to correct the lie when the person lying has a D for Democrat next to their names. So I think it is safe to say the MSM is the voice of the Democratic Party. When someone lies for such a long time, it is hard to believe anything that is said.
They seem to get pleasure from lying; they behave like undisciplined children who receive no punishment. The MSM has reinforced the lying so now it is the norm. Many people say “ha ha they all lie.” The adverisers on the MSM are often lying too. The only punisher is to vote against them and not buy what they are selling. The message must be sent at the polls. There are consequences for lying for elections and MSM ratings.
It’s hard to label ABC, NBC, CBS, PBS, the NY Times and others as “main stream media.” There’s nothing mainstream abut them. I’m using “old media” now, versus “new media” consisting of the Internet and other new media outlets. Others use different names but nothing has caught on that I know of. Lame street media, LSM, was one. Leftist or liberal media are two more.