There is a solid group of prominent and influential American Jews who consistently and stridently criticize Israel's atrocities. This group includes Noam Chomsky, Glenn Greenwald, Michael Brooks, Sam Seder, and Bernard Sanders.
I think a bigger concern is that Sanders would get "struck by a bolt of lightning", "commit suicide", or befall a similar fate shortly after taking office. Good thing he had this falling out with Warren, making it very likely he would name Gabbard as his VP pick. Of course, Gabbard might also "slip on a banana peel" thereby falling to her death, but that would seem harder to pull off. Get aboard the Sanders train, bro.