Look, Jews (and Catholics) were heavily discriminated against by Protestants when they first came over and for many decades after that. Naturally, they’re going to be attracted to a party, The Democrat Party, that welcomes them. It’s difficult to determine how many Jews would be conservatives if it weren’t for people like Henry Ford, the so-called saviors of Christianity, the KKK, and other people and orgs who made their hatred of Jews and other non-WASPs a very open secret.
Sorry, but they brought their European liberalism and unionism to America, evil America did not ruin them, it was one of the things that Protestants created America for, to escape European leftism.
The Democrat Party that they were devoted to WAS the party of the KKK.