"The Long Walk" was one of the first things he ever wrote, while in college, and it was inspired by his anger over the Vietnam War. How he saw America as feeding its young men to a war machine, just lining them up and marching them off to their deaths. "Dolores Claiborne" is about the patriarchy. "Rose Madder" has a woman married to an abusive, dirty cop and his cop friends all protect him.
His recent novels have been more name dropping political tho. But, hey, when you're Stephen King you get to write whatever you want and who's going to tell you not to? π Not your agent or your editor and certainly not the publisher.