I think King as always been liberal, much like Clive Barker (only not so much as Clive, who is a prancing fairy/pedo sympathizer).
I’m reading my way through the dark tower series again. His political leanings do come out in some of his books but I don’t read them for a political message and can enjoy a good book without getting upset.
One of my favorites was “Insomnia” but one of the main characters was a rabid crazy right winger who tried to crash a plane load of explosives into a civic center full of feminists. Despite that, it was a top notch read.