Vermints, or vermin? Either one works for me.
Actually, I typed “varmints.” I didn’t give it much thought and have no idea how it came to be part of my vocabulary as I can’t say that I’ve ever written it before. (I’m thinking maybe it came from watching the Beverly Hillbillys or something.) Anyway, Wikipedia’s description of vermin probably comes close to my intended application to liberals:
http://en.wikipedia.org/wiki/Vermin
The term is also used as an extremely pejorative characterization of a particular class or group of people as inferior and subhuman, and often considered social parasites. Application of the term can be wide, having been applied over the centuries in different languages, to various groups, and its use is usually based on a perception that the target group’s views are “disease-like,” or that such groups exist out of sociological balance with the common society.