That's a very big gamble. USA are very much tied to Israel for one. Second see where the money is coming from. A lot of it is Jewish. Not that I am against Jews by the way. It is always about money. Israel is also tied very much with the military. Money buys influence, influence is power. Latino's and such have very different needs and are much more willing to jump to the side that provides them with what they need. And that is mostly jobs and prosperity.Seems I was wrong.
But let's say that yes most Jews support Israel. I doubt this would be that big of a deal as you are making it out to be. When you factor in the other minorities like Latin Americans, Native Americans, Muslims and Black Americans, losing the Jewish vote (even though there is a chunk that doesn't support Israel) shouldn't make them lose. What they lost will be regained through other minorities.