Incumbent Republican Mike Simpson faces Democrat Elinor Gilbreath in Idaho's 2nd District general election on November 3, 2026, with multiple minor-party candidates also on the ballot. The district's R+13 Partisan Voter Index and consistent "Solid Republican" or "Safe Republican" ratings from nonpartisan analysts underpin trader consensus on a Republican victory margin between 15% and 25%. Simpson's primary win and the absence of competitive polling or major campaign developments in recent weeks have kept probabilities concentrated in those ranges while holding any Democratic outcome near 1%. Factors that could widen or narrow the margin include shifts in national midterm dynamics, turnout among rural and suburban voters, or late-cycle events affecting candidate visibility in this low-competition race.