In the United States, perhaps, but it's worth noting that in the US, the vast majority of Jews live in New York City, which is culturally much further to the left than the rest of America to begin with. I think that's a much better explanation of Jewish voting patterns than the fact that they're Jewish, because if you look to other countries, the left-wing association doesn't necessarily hold true. Here in the UK for instance, 70% of Jews vote Conservative.
The main issue I have with the way that these conversations are framed is how it's often implied that Jews have some kind of duplicitous loyalty; as if to say that a Jew will pretend to be your friend to your face, only to plot your downfall behind your back. This never seems to be assumed of other ethnic groups, and it's assumptions like this which form the basis of antisemitism. I point this out because I notice that a depressing number of people who perpetuate these kinds of beliefs don't even seem to be aware that they're doing it; it's become such a pervasive trope.
The partisan nature of these discussions is of little interest to me, because the truth is that antisemitism exists in roughly equal measure on all sides of the political spectrum, and it's always the same. There is no shortage of Jews involved in right-wing causes, just as there is no shortage of Jews involved in left-wing causes. It's the act of singling out these individuals on account of their Jewishness which I find to be deeply suspect, and I think you ought to as well.