Incumbent Democrat Summer Lee faces Republican James Hayes in Pennsylvania’s 12th congressional district on November 3, 2026. The district’s underlying partisan lean and Lee’s established base support trader consensus for a Democratic victory with a margin most likely between 25 and 35 points. Primary results and the absence of competitive polling or major campaign shifts have kept probabilities concentrated on those ranges, while the slim odds attached to a Republican win reflect structural barriers in the district. Late-cycle national spending, turnout patterns in suburban and urban precincts, or unexpected candidate developments could still adjust the final margin within the resolution window.