I can truly guarantee a whispering campaign among evangelicals about Sanders being Jewish.
Trump is the most unpopular president to ever run for re-election. He has a cult of about 35 percent of the population. So his only path is to make his opponent more unpopular. That's what he did four years ago with help from Russia, compliant media, and Comey. It's why Republican senators are now suddenly planning to investigate Burisma, it doesn't matter if they find anything, Trump just needs to constantly repeat Burisma like he did email. The country knows he is corrupt so he has to make people believe there is no difference between him and his opponent, they are all crooked.
So yeah, he will turn a mild democratic socialist into Stalin, Mao, whoever AND he's a Jew.