Left/right Liberal/conservative Democrat/ republican
We are drawn to one or the other. If you can find out what a person champions in several areas you can predict what they champion in other areas that might not even be political. Its "where we are comeing from".
If I know who your heros are, I can tell many other things about how you belive and vote.
Of course there will always be abberations in some areas, but overall I belive I am accurate in claiming this.
If a person is okay with gay marrage, pro choice, strict gun regulations, permissive drug laws, against capital punishment, they wont be voteing republican.
Religious beliefs or the lack of them also is the major indicator here but I will let you guess on that one.