If there’s one thing the not-so-pro-Israel Jews I know really hate, it’s being overtly treated as if they’re stupid. If they start thinking Obama is going to make them look (more) stupid, it’s game over for NY fundraising.
So your lib Jew friends don't mind being treated as if they are stupid, as long as it's kind of covert, and they don't have to openly acknowledge that they are dupes. It fits.
But they sure will allign with the anti-semite left, but I guess that is considered guile not stupidity.