Idaho's U.S. Senate contest between longtime Republican incumbent Jim Risch and independent challenger Todd Achilles remains noncompetitive, with recent polls showing Risch ahead by roughly 18 points and forecasters rating the seat safe Republican. This dynamic shapes trader expectations for total ballots cast, as limited statewide excitement and the absence of a Democratic nominee on the ballot after David Roth's July withdrawal tend to suppress participation relative to more contested races. With roughly 1.035 million registered voters and primary turnout near 30 percent earlier in 2026, current market pricing around 600,000–680,000 votes reflects standard midterm general-election patterns in the state. Factors that could shift the range include early-voting volume, get-out-the-vote intensity by both campaigns, or any late developments that increase or dampen interest among unaffiliated voters.