I am not quite sure what JayMatt’s position is. But I agree that Jews as Jews should never express any public opinion that is even mildly controversial and definitely never endorse political parties or candidates. Even if it is directly related to Jewish Issues it should be minimized as much as possible.
We tend to forget that we are in golus. This is not our land and it is not our place to have protests or to tell the goyim what to do, it only creates more anti-semitism. Behind the scenes advocacy is fine but in public never.