Idaho’s 2nd congressional district features strong Republican partisan lean and long-term incumbency advantages that underpin trader consensus around Mike Simpson’s victory. Simpson, first elected in 1998, defeated primary challengers in May 2026 and maintained a substantial fundraising edge over Democratic nominee Ellie Gilbreath and independent candidates. Partial vote tallies from the November 3 general election show Simpson leading, consistent with the district’s historical margins exceeding 25 points. The market’s 99.8% implied probability for Simpson reflects these structural factors and limited late-cycle shifts. Resolution hinges on official certification; an extremely narrow margin triggering a recount or widespread tabulation disputes remains the primary, though improbable, path to altering the outcome.