Elect 60 (or more) of them to senate for the first time in over 40 years.

If they don't pass their core policies, then there is no party representing the people and the radicals will have the opportunity to become mainstream and tear it down.

If they do pass campaign finance laws, overturn citizens united, election reform, expand congress, reform the SCOTUS, tax the rich, and public option healthcare or even Medicaid for All: we all win.

That still isn't enough to cut off Israel, but certainly lessens their power by gutting AIPAC and substantially lowers their support in Congress compared to before.