I've seen some party voter registration statistics by county and ethnic group across several states. Party registration can be a considered a reasonable proxy, usually, for the way the voter votes. In general, the Dem registrations of Jewish voters are about 10 percentage points higher than their non-Jewish neighbors in their particular county.
Yes and no. In the past I've actually broken down "Jewish" vote vs total vote in various Congressional districts with large Jewish populations. I used the Chicago area and a few NYC and NJ districts if I recall. They elect democrats. The districts. Since most Jews, virtually all who are covered by exit polls, live in urban areas, you won't be surprised that there's not much difference from their neighbors.
Rural Jews, give me a break, no one polls that, they're hard to find.
An interesting exercise, look at Jewish Senators vs Jewish population
OK, Chuckie Schumer, and NY has an 8.4% Jewish population, maybe it's significant. Boxer and Feinstein, CA 3.3%, not sure how significant the Jewish vote is. Wisconsin, Kohl and till recently Feingold, 0.5%. Minnesota, Franken, and of late Coleman and Wellstone. 0.9%, more than Wisconsin, but something else might be working here. Sanders of VT, 0.9%. Wyden of Oregon, Levin of MI, you get where this is going. These are political issues, not religious. And in a political context it's a big mistake to ascribe religious motivation to peoples votes, more accurately a big loser. You can complete the list with guys like Cardin and Lieberman, more than the less than 1% examples, but 4%- isn't much.