State Rep. Chris Rabb leads trader consensus at 56.5% implied probability in the tight PA-03 Democratic primary just days before the May 19 election, driven by leaked internal polls from rivals' campaigns showing him ahead and a Philadelphia Inquirer recommendation after candidate interviews. State Sen. Sharif Street trails at 41%, bolstered by labor union endorsements, his former Pennsylvania Democratic Party chair role, and establishment fundraising edge, while physician-activist Ala Stanford holds 4% amid the field's narrowing. Recent forums and debates highlighted policy divides, including Gaza stances, fueling Rabb's progressive surge from trailing Street in early May prediction markets, underscoring voter turnout and Philly-area turnout dynamics in this open seat replacing Rep. Dwight Evans.