Isn’t the question you are really discussing, “Halachically okay to be Democrat in the21st century?”
Note that “D” is capitalized refering to the “party” not the idea (which increasingly conflict), and is limited by time, and implicitly by place to contemporary United States.
Whether the Democratic party is “liberal” is a different issue. I suspect many of the liberals of the 19th and early 20th century would suggest that are clsoer to socialists and fascists than to liberals.