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It should be noted the the Jewish population of the United States is largely concentrated in urban areas. About 80% of the Jewish population lives in 20 cities. Twelve of the twelve largest cities in America have Democrat mayors. Nearly 60% live in 6 metropolitan areas, NY/NJ, Los Angeles, Philadelphia, Miami (Republican mayor), Boston and Chicago. If you think these cities are Democrat because a small minority of citizens are Jewish you're missing the point. They largely vote like their neighbors.
Read E. L. Doctorow's Worlds Fair.
In it (a pretty good book, too), ALD fictionalizes an America neutral in WWII, with Lindbergh's America Firsters running the country. In the book he spells out his "Jewish" fear and the "danger" of "Right Wing" Christians, "Conservative" political thought, Capitalism, and "latent American Anti-Semitism."
Good read. Sort of a political "Portnoy's Complaint."