Bob Brooks holds an 81.5% implied probability in the Polymarket for Pennsylvania’s 7th congressional district because traders view his May 2026 Democratic primary victory, strong labor union backing, and endorsements from Gov. Josh Shapiro as key advantages in a competitive Lehigh Valley seat. The district narrowly favored Donald Trump in 2024, and incumbent Ryan Mackenzie has raised substantial funds while emphasizing tax relief and working-family policies. A late-September Franklin & Marshall poll showed Brooks ahead 45-40% with 16% undecided, though most nonpartisan forecasters still rate the race a toss-up. Heavy outside spending from both parties and the seat’s status as a potential House control pivot continue to shape trader assessments of the November 3 outcome.