After having an Israeli girlfriend for almost 4 years (she's not political) I have an idea why:
Most of the Jewish people I've met aren't much different than the run of the mill average media influenced voter. They go along with what the "elite" and the "intellectuals" "think". Actually the only friends she had that really knew anything about politics were VERY conservative, her one friend has been a confidant and worked closely with Bibi forever.
The rest of them can only parrot the same ridiculous hack arguments you always hear, no depth of political thought whatsoever, even though they're successfull and good at what THEY know. There is also a component of having Republicans called "Nazis" for about 30 years that doesn't help. The Christian "right" they either believe or have been told that Jews are going to hell.
Lastly, it seems that except for the Hasidics the democrat Jewish voter if religious at all belongs to a "reform" synagogue, the only difference in the philosophy and thought from let's say an Al Sharpton rally in thier view of Republicans is the color of their skin.
This religioius phenomenom is becoming more popular in churches of all denominations. Jesus would have loved everyone and been a multiculturalist, communal living hippie if he were around today. Love of money is the root of all evil, except they leave out the "Love of" part. It's a VERY liberal philosophy, one that the left encourages, a religion where there are no moral absolutes, no judgements, etc.
I notice that liberals tend to be more wealthy than average. At the same time they generally think that wealth creation is evil, but that the solution to all problems is, "throw more money at it."
I agree with your post and had the recent unfortunate experience of living it in a political discussion with some acquaintances where the simplistic parroting was all the 'thinking' going on.
As to "except the Hasidic" you are leaving out the Jewish Orthodox who are not Hasidic but polls show vote Republican.