Ted Cruz is among other things, a fanatical Israel-worshipper. There’s probably not a single other candidate (not even Sanders, I’d bet) so bent over backwards in absolute and unconditional support for the Jewish state.
But that doesn’t matter, none of that prevents him from being labeled an “anti-semite”. As a Christian, he is hated by the Jews and their lackeys. He needs to learn; no amount of groveling will ever change that.