America is rather divided right now, so I'd say the Klingons are the red states and the Federation are the blue states.
I'm not sure that's what Harberts meant. I get the impression from what I've read that the story involves a House leader trying to unify a divided Klingon Empire. So maybe the idea is that the Klingons are analogous to Americans as a whole, a society split by internal divisions and mistrust and trying to find a way to work together again.