It's one of those 800lb gorilla's in the room.
The problem is that many American Jews are reform jews. Reform Judaism is like a carbon copy of the Democratic party, only with some support for Israel.
These Jews often lack proper understanding of Jewish customs and Torah.
I spent a year living around Orthodox Jews, knowing very little about Judaism beforehand, and now can often out talk reform Jews on points of torah.
Now that said, Judaism does have strong parallels with the Democratic party, but there are key differences that are HUGE.
So you're saying like many Catholics.... they're "Cafeteria Jews"? If so... the likes of Wasserman Nazi Schultz ought to be thrown out because her ilk is their own worst enemy. The sad thing though is Jews keep reelecting her and THAT is truly sad.