DRD4 encodes a receptor molecule for a neurotransmitter called dopamine. (Neurotransmitters are chemicals that carry signals from one nerve cell to another.) Those with a variant of DRD4 called 7R, and also a large network of friends acquired during their adolescence, tended to be (in the American sense of the word) liberals ie, left wing.
Below are the key words or phrases that I always try to learn in the local language before travelling (or you can carry a cheat sheet with you, like the one I used in Paris).