State Representative Chris Rabb won the Democratic nomination for a congressional district in Philadelphia on Tuesday, defeating establishment-backed candidates despite facing significant opposition from party leadership and major donors.

Rabb, a self-described Democratic socialist, finished 15 percentage points ahead of his closest competitor in the primary election. He is expected to advance to Congress as no Republican candidate filed for the general election. The victory came despite endorsements for his opponents from Philadelphia Mayor Cherelle Parker, members of Pennsylvania's congressional delegation, and the city's Democratic Party organization.

His main rivals included state Senator Sharif Street, who received support from building trades unions that contributed more than $600,000 to his campaign, and Dr. Ala Stanford, who benefited from $3.5 million in spending by the political action committee 314 Action. Street also received campaign appearances from U.S. Senator Cory Booker and Mayor Parker.

Rabb's campaign was supported by progressive organizations including the Working Families Party and received at least $1.8 million in outside spending from allied groups. Representative Alexandria Ocasio-Cortez campaigned for him four days before the primary. His platform included support for government-run grocery stores, an expanded minimum wage covering gig workers, and abolishing Immigration and Customs Enforcement.

The 55-year-old legislator has served five terms in the state House and positioned his campaign as opposing establishment politics within the Democratic Party. He argued that party leadership prioritizes donors over voters and called for more responsive governance. Rabb captured 45% of the vote in an election where fewer than one-third of registered Democrats participated.

Progressive groups view Rabb's victory as significant momentum, with similar candidates running in House races across New York, California, and Michigan. However, some Democratic strategists express concern that far-left candidates could alienate moderate voters in what many see as a favorable political environment for Democrats to challenge Republican incumbents.