Using the Meyers-Briggs Type Indicator. I find Fs to be Democrats, and Ts to be Republicans. Mostly that is.
Considering Ts use Logic-Judgements even at the cost of values, and considering Republicans are more logical, it makes sense. Also, considering Fs use Value-Judgements even at the cost of logic, and considering Democrats are more value-centric than logical, it falls into place.
A friend, and INTP who espouses Democratic ideals, answered me when I question him about how such a logical person could be a Democrat. He told me that he just "feels" their way more. And that it wasn't logical. Well put. And he's about the only Democrat who I think can back up what he believes, because he actually understands why he believes it.
Funny thing is all these F Republican presidents. George "W" Bush being an ESFJ, Ronald Reagen being an ESFP. Maybe its the age of TV, being the news is mostly Democrats, even Republicans have to be F to get into high office.
Anyway, its just a thought. Well, here's another. Women who have low necklines (clotheswise) are Democrats. I used to watch C-SPAN a lot, and, IIRC, with the exception of one Democrat, all Republican woman had high necklines, and all Democrats low lines. That's in the House. The Senate can be strange though. Also, Republican men can't answer attacks very well, where Democratic men come off smothly, and make much better speakers.
I still think it all boils down to T versus F. Since it is judgement, it affects the way we dress and opine, amongst many other things.