AIPAC's record $120 million spending in 2024 elections reveals how a once-bipartisan pro-Israel lobby became a polarizing force in Democratic politics, forcing candidates to choose between supporting Israel unconditionally or facing well-funded primary challenges that backfired spectacularly. AIPAC shifted from bipartisan consensus-building to aggressive single-issue politics after 2015, when it sided with Netanyahu over President Obama on the Iran nuclear deal, creating the first major U.S.-Israel policy divergence.