The intermarriage rates of Jewish people is very high, particularly among non-Orthodox Jews.
The notion of a Jewish vote or Jewish bloc is an oversimplification of what is actually on the ground.
A small number of wealthy Jews give large contributions to the Democratic Party. They represent themselves and nobody else.
In general, I agree with you.
Specifically, I was thinking of southeast Florida when I wrote my comment.
Miami Beach and Broward and Palm Beach counties have very large and politically important Jewish communities.