That’s true that US conservatives associated with the Republican Party are profoundly philosemitic. However, this is a fairly new thing. There is also the anti-Semitic Pat Buchanan wing of the party too, you know?
And if you took 100 anti-Semites in the US, 95 of them would be conservatives, either Republicans or Libertarians.
Leftwing anti-Semites are not that common. Nowadays a lot of Zionist shits are trying to say that there is all this liberal or Left anti-Semitism (the “new anti-Semitism”), but it’s mostly garbage. These folks are simply anti-Israel to out and out anti-Zionists. Most Left and liberal Israel-critics or even anti-Zionists are not anti-Semites.
A few liberal to Left anti-Zionist types do get into anti-Semitism, but when they do, they seem to gradually drift towards the rightwing! In particular, they start being sympathetic to either fascism or Islamism or both. Especially they tend to be pro-Nazi.
It’s really strange the way that works.
This makes me think that there is something intrinsically rightwing about anti-Semitism and something organically anti-anti-Semitic about liberalism or Leftism.*
With some exceptions.