The Ultimate Conundrum.
In the 1800's a new "enlightened" form of Judaism arose. Reform Judaism. The majority of these new immigrants embraced this new form of Judaism, in part, IMHO, to avoid being persecuted by their hosts. Reform Judaism does not require the strict observance of the Mitzvot (commandments), so they started like their hosts, to eat pork and shellfish, not observe the sabbath and began intermarriage.
All the while, still stressing social justice. So, like any liberal religion, the government became the the new arbiter of justice, not G-d. Look at the World Council of Churches. Same thing. Anytime G-d is pushed out the vacuum is replaced by man-humanism. When G-d is replaced by government, freedom is replaced by tyranny. The Jew does have a powerful mind which can be used for great good or great evil. The Jewish soul needs the guidance of Torah and the obedience to HaShem to bring about true tikkun olam, repair of the world.
That is why they vote democrat. Previous persecution, liberalized religion, to "fit in" and not be so "different" and thereby replacing G-d with government to bring about "social justice".