The Democratic Party’s internal debate over Israel reached a new intensity this week, when 103 House Democrats—nearly half the caucus—voted to eliminate all US military aid to the country. According to congressional observers in Washington, the tally was the largest defection on Israel assistance in decades and came amid a surge of primary victories by candidates who made opposition to the Gaza war central to their campaigns. The vote, though symbolic, underscored a structural realignment: legislators who had once treated support for Israel as a political necessity now calculate that distancing from the American Israel Public Affairs Committee (AIPAC) and the Israeli government can energise progressive activists and deliver primary wins.

Viewed from Jerusalem, this shift reflects a collapse of the bipartisan consensus that long shielded the US-Israel relationship from domestic political swings. Analysts in the region point to polling that shows 80 percent of Democratic voters now hold an unfavourable view of Israel, a sentiment that candidates in districts with large Arab American or young, left-leaning populations are quick to harness. In Michigan’s Senate primary, the candidate backed by Senator Bernie Sanders and Representative Alexandria Ocasio-Cortez, Abdul El-Sayed, has made opposition to AIPAC spending and calls to condition aid a signature issue, even as he distances himself from the “socialist” label his opponents attach to him. Incumbent lawmakers such as Representative Pat Ryan of New York have publicly renounced AIPAC’s financial support, calculating that the progressive base now rewards such breaks.

The fallout is visible across the map. In Maine, the front-runner to replace a fallen Democratic Senate nominee, former state Senate president Troy Jackson, runs on a platform that includes ending military aid to Israel, mirroring the agenda of the progressive group Our Revolution. Republican leaders, including House Speaker Mike Johnson, frame these developments as evidence that Marxism is capturing the Democratic party, while former members of the Democratic Socialists of America warn that communist factions are using the Israel issue to purge moderates. The split also complicates general-election arithmetic: in Michigan, blue-collar and moderate voters remain sceptical of candidates tied to socialist imagery, and Republican operatives have begun portraying Democrats as captive to an anti-Israel fringe.

The Michigan primary on 4 August and the Maine state convention on 8 August will offer the next concrete tests of whether progressive energy on Israel translates into durable electoral coalitions. With further House votes on security assistance expected in the autumn, the Democratic leadership faces mounting pressure to reconcile a caucus in which nearly half its members now vote against military aid. As viewed from European capitals, the transformation of Israel from a unifying foreign policy pillar into an internal wedge issue marks one of the most consequential shifts in American politics ahead of the 2026 midterms, with implications for Washington’s posture in the Middle East that both allies and adversaries are monitoring closely.