In a civil election, does Judaism teach that one should vote for Jewish candidates over non-Jews? What if the voter supports the other candidate's positions on every other issue much more?
There are plenty of wicked Jews who have no place in in positions of authority. Even YHWH has pointed out that pagans have demonstrated capability of performing their lifestyle and public duties better than supposed men of God.
I think Seth J's simple question (in a comment on the question) is an answer in itself. I just expounded on it with deeper reflection.