In the context above what I am suggesting is that if and when he is free to put real pressure on Israel to be serious about peace with the Palestinians, Obama should make best use of the Kennedy quote – “What we want from Israel arises because our relationship is a two-way street”. And he could and should put flesh on that bone by saying, among other things, that it is not in America’s own best interests to allow Israel to go on denying the Palestinians an acceptable measure of justice. But his crunch point could and should be something like this. “What America wants and needs, in order to best protect its own interests in the Arab and wider Muslim world, is an end to Israel’s denial of an acceptable amount of justice for the Palestinians. Unless we get that, I as president will have no choice but to use the leverage at my disposal to press you.” Israelis would know, even if Obama didn’t spell it out, that the pressure would include an end to American vetoes of Security Council resolutions condemning Israel and sanctions.
If Obama was to go public with such a position in the wake of defeat for the Zionist lobby over the Iran nuclear issue, I think it’s reasonable to assume that a big majority of Jewish Americans would signal, if only by their silence and/or refusal to condemn Obama, that their first loyalty was to America not Israel.