In the 2026 Idaho U.S. Senate race, incumbent Jim Risch faces independent challenger Todd Achilles after the Democratic primary winner withdrew in late July, leaving a low-contest general election on November 3. This dynamic, combined with Idaho’s historically modest general election participation rates and over one million registered voters, keeps trader focus on turnout in the 600,000–680,000 range. Primary turnout reached roughly 30 percent in May, providing a baseline, while campaign fundraising—Risch’s multimillion-dollar advantage versus Achilles’s more modest totals—offers limited additional mobilization. The absence of a major-party Democratic candidate and the seat’s safe Republican rating reduce expected intensity compared with competitive battlegrounds, leaving early and absentee voting trends plus any late-cycle get-out-the-vote efforts as key variables that could shift totals within the narrow leading bins.