Democrat Jews only call themselves Jews for virtue signalling purposes. Back when Bernie was still in the race, people touted that he would be the "first Jewish candidate" for a major party, even though he's an atheist and even though the Christian Jew Barry Goldwater ran on the Republican ticket fifty years ago against LBJ.

Why did 80% of jews vote blue in 2018? Why do ~20 democrat congressmembers have Israeli citizenship? Why is there such a massively disproportionate amount of jews involved in leftist media and politics? These are just plain facts.
And before you say “jews in name only”, every jew knows that jewish is an ethnicity first and a religion second.