Incumbent Republican Mike Simpson faces Democrat Elinor Gilbreath in Idaho’s 2nd district on November 3, with all major forecasters rating the seat solid or safe Republican. Simpson’s primary win and substantial fundraising edge, combined with the district’s consistent Republican performance in recent cycles, anchor trader expectations for a GOP victory margin in the 15-25% range. The spread across adjacent margin buckets reflects the absence of public polling and limited late-cycle visibility into turnout or issue salience in eastern and rural counties. Minor candidates and the low probability assigned to a Democratic win underscore structural barriers, while any shift would likely require unexpected national or local developments in the final weeks.