Idaho’s strong Republican voter registration advantage and Jim Risch’s long incumbency as the state’s junior senator anchor the market’s heavy weighting toward his reelection on November 3. All major forecasters rate the contest Safe or Solid Republican, reflecting Risch’s prior 29-point margin and consistent primary strength. Todd Achilles, the leading independent and former Democratic state legislator, has drawn some support after the Democratic nominee withdrew, yet faces structural headwinds including limited name recognition statewide and Risch’s substantial fundraising edge exceeding $4 million. Recent internal and public polls show Risch ahead, though by narrower margins than historical norms. A late scandal, health development, or unusually large polling miss would be required to alter the outcome.