To be antisemitic means you hate all middle eastern people, not the jews. The jews are not a race, they are a religion they are also not middle eastern.
Trumps comment can be taken this way: be careful voting for the dems, they are one or two steps away from Hitler.
Yep, because Jews (for the most part) are not semitic. Definition: a subfamily of Afroasiatic languages that includes Akkadian, Arabic, Aramaic, Ethiopic, Hebrew, and Phoenician.