A common misconception amongst conservatives seems to be that Israel is the #1 issue for most Jews. Most that have never been there or have family there really don't care about it. And furthermore its not as if the Democratic Party is openly pro-BDS. There's no reason to expect the Jewish vote to shift.
I remember an anecdote from the 2000 election, where one voter--a Christian fundamentalist from some place like South Carolina--told Joe Liebermann that he liked him but couldn't vote for him because Lieberman hadn't "accepted Jesus Christ as his Lord and Savior".
For Jews, I suspect that support for a foreign country many have never visited is probably a secondary issue to being told by their fellow Americans that they're unfit for public office in their own country.
If there's any party platform out there that even vaguely hints at the superiority or centrality of Christianity (and therefore implies the inferiority or marginality of non-Christians), it's likely to be a huge turn-off.
