Never mind, I got mixed up, you're talking about just CNN.
https://www.youtube.com/watch?v=fHKiVkeup2o
CNN has long been a mix of news and opinion, like all news media ever. That’s why media exists: to push facts and interpretations of those facts.
Media is not a charity: William Randolph Hearst and Ted Turner want something for their money: they want to control the narrative.
It has always been blatant: you just haven’t been paying attention. Hearst started a war! He was such a reviled figure that one of the greatest movies ever made was made to dunk on him.
I remember when Clinton tried to attack claimed al Qaeda infrastructure after the embassy bombings and made a speech about bin Laden (the first time I heard the name) they asked if it was to distract from Monica. Compared it to the film Wag the Dog.
CNN was not in the beginning. They were a scrappy news channel that came to prominence with real reporting (most notably in the Iraq war). They got corrupted once it was clear they could not be ignored.
News sources have probably always had bias, but it was never such blatant characature back in the day.