For a fascinating read, check out the reactions of primarily Jewish readers to the disinvitation of Sarah Palin from the anti-Iran rally. The rally organizers decided to disinvite Palin after Hillary Clinton refused to share a stage with her, and the reaction from Jewish rally supporters is almost uniformly against the disinvitation.
I've asked before and wondered for a long time why American Jews almost monolithically support the Democrats, but maybe that's changing.