DIY -It's a good thought, but Jewish congregations are very independent, and hire and fire their own Rabbis. I think a Republican rabbi would have trouble getting hired in most American Jewish congregations.
So it is tradition then that continues to mold Jewish people to stay democrat or liberal thinkers. ?
I've been thinking about this, and, having been there myself, I think I can say that radicalism is a 19th century tradition among enlightenment Jews, mostly in response to oppression in central and eastern Europe.
Baby boom radicals joined the Democratic party in 1968 and 1972, and in 1980 a lot of Jews, myself included, believed all the propoganda about the religious right, equating them with the ultimate bogeyman - Nazis,
In the 1960's, the left turned against the Vietnam war, a war started by leftist Presidents, and when Nixon was elected in 1968, the left turned against the America that nominated Humphrey, and elected Nixon.
Because of this radical tradition among enlightenment Jews, and the slandering of the religious right, modern Conservative and Reformed Jews can be found in disproportionate number in that America-hating left, which is now the base of the Democratic party.
I am 57 years old and I remember a lot of this.