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I think it goes a bit deeper. Most Jewish immigration occurred at the end of the 19th and early in the 20th century at a time when antisemitism was still a feature of American life and before socialism and communism had their track record of mass murder and societal destruction. A sizable proportion of the leading figures of those philosophies were European Jews and, in fact, Russian Bolshevism had many Jews at the core of the leadership. That didn't really change until the establishment of the State of Israel and its alignment with the west. That was when Stalin's real purge of Jews, including many of his closest associates such as Molotov, whose wife was Jewish (see: the Doctors' Plot) took off. Antisemitism built on the ingrained Russian variety became a feature of Soviet life.

So you have several generations of Jewish Americans whose political identity has been based on the Democratic Party of Roosevelt and Truman and who, in their hearts of heart, still see Republicans as the rich, wasp, no-Jews-allowed country club set. Add in the intentionally misleading but universally accepted tags of right-wing and left (National Socialism was VERY much a socialist movement and philosophy) and you have the formula for, as with African Americans, a staunch knee jerk core of millions of Democrat voters.

Finally, many American Jews do not have the visceral loyalty to and regard for Israel that their parents and grand parents had a generation or two ago. Like most good Liberals, they are perfectly ready to see the US and anyone on our side (including if not especially Israel) as the force of evil and oppression in the world. How this self hatred began and been fostered through the education system and mass media of this country is maybe the greatest scandal of our history.