Patty Garcia secured the Democratic nomination for Illinois’s 4th Congressional District after incumbent Jesús “Chuy” García withdrew following the primary filing deadline, citing health and family reasons, leaving her as the sole candidate on the March 2026 primary ballot. The district’s southwest Chicago and suburban base has delivered consistent Democratic margins exceeding 25 points in recent cycles, supporting trader consensus around her commanding lead. Republican nominee Lupe Castillo advanced unopposed but has reported minimal fundraising. Independent challengers failed to qualify for the November 3 general election ballot. Scenarios that could narrow the gap include late-breaking developments affecting turnout or candidate viability, though the district’s partisan composition and Garcia’s organizational backing limit realistic paths for the Republican nominee.