Were Jewish Americans heavily D prior to FDR? I'm thinking about how far the black vote swung toward the Democrats after LBJ signed the Civil Rights Act and I'm wondering if FDR/Truman defeating Nazi Germany didn't have a similar impact? That would result in Jewish families that were already in the country during WWII voting significantly more D than more recent immigrants.
I stumbled across this photo of some HIGH ENERGY 1930s Jewish ladies on Wikipedia today. For all I know one of them could be my great-grandmother!