Jews who still vote Democrat are:
1. Leftist college kids with no Jewish observance in their lives and who know more about Che Guevera than they do about Pesach.
2. Senior citizens who don't want to betray FDR.
3. Baby Boomers, former hippies, and their children who may live pretty solid, normal lives and don't have a clue because they get their news from CNN, Brokaw, and the New York Times.
It's the same on the Christian / Gentile side of the aisle. Point out any regular Sunday morning churchgoer, I'll guess Republican. Point out any regular Saturday night clubhopper, I'll guess Democrat. And I'll usually be right on both counts.
2. Senior citizens who don't want to betray FDR.
Now that's an interesting category. I would sort of expect some manner of lingering resentment towards FDR for remaining officially neutral while Hitler was razing the ghettos, and waiting for Hitler to declare war on the U.S. rather than immediately jumping in when the first bombs fell on Britain. Poland, even. But then, he did preside over the majority of the War of the Holocaust, and commit to eradicating Nazism... after Pearl Harbor.