Republicans represent the establishment, normalcy, orthodoxy.
Democrats are more representitve of the outsider, the devients. Catholics were considered outsiders at one point, so Irish immigrants were always Democrats. In fact all immigrants have associated with the Democrat Party.
Gays, blacks, etc. also consider themselves outsiders and vote Democrat.
Jews apparently have followed that tradition, though I am a Republican.
That statement is grossly oversimplistic, a tired cliche. It depends upon what period of American history you are talking about and what defines "the establishment" and "the outsider." Obviously, many parts of the current "establishment," e. g., the massive government bureaucracy, are controlled by 'Rats.
And certainly Jews, in general, are not "outsiders" in today's US, from just about any objective standard. Probably the majority of American Jews alive today are at least second generation American-born and have ancestral roots in the US going back to before WWI. In addition, Jews as a group are wealthier and more educated on average, and receive no benefits from "affirmative action" (in contrast to other "outsiders").
Furthermore, it should be noted that the two most statistically antisemitic and anti-Israel groups in the American population, Moslems and black radicals, are pandered to by the Democratic Party.
The fact that the allegiance of the majority of today's American Jews lies with the 'Rats is more of a pathological addiction than a "tradition."
I’ll concede the Dems represent the deviants, but as for being outsiders/anti-Establishment ? Nope. It’s my beliefs and standings that have been run down by these cretins, and I’ve been on the outside since the day I aligned with the GOP 23 years ago. The Dems ARE the Establishment (along with their RINO stooge/meatpuppets).