Mainstream media here is generally about 90% registered democrat, but some of those registered folks have realized that there's money to be made during the day by pretending to be less liberal.I had to chuckle at that. That's the baseball 'World Series' viewpoint (only American teams compete, the rest of the world doesn't count).
That might arguably be true in the USA, but here, the media, especially the old print media, is almost entirely right wing. And Jacob would argue that out of the two left-leaning mainstream papers, even one of those is rabidly anti-Corbyn.
IN the old days, it was just understood that media other than a few batty opinion writers (on both ends, but generally the straight up commie "there's no fact in the world, just people who say that their opinions are facts" types), most of the media was corporate democrat type, if a little idealistic, it was expected. They hated reagan and politicans of that type (the simple cowboy types, if you know what I mean, except reagan himself was a smooth pimp). Long story short, once a few were successful at offering limited republican curated news, then that market started to thrive, and the regular media went more overtly nasty, and now has mostly given up being objective (stating that literally as a business plan - it's more profitable. Pretty much the case that whoever is in office, the opposing cable news types will thrive).
We used to note that the news in the UK was very tabloid-y, and I guess it is (plus, we're too prudish to ever have "news" with back page girls on it here, but maybe that's me-tooed out of existence now), but our media is now something worse - attempts to claim legitimacy with nothing but negative intent from both sides.
President-wise, though, they will only turn on Biden if he does something extremely scandalous.