Incumbent U.S. Senator Jim Risch commands 95% trader consensus in the Idaho Republican Senate primary on May 21, driven by his longstanding conservative record, superior fundraising exceeding $1 million, and polling averages showing him ahead 50-60% against challenger Joe Evans. Recent April surveys from RMG Research and others confirm Risch's double-digit leads among GOP voters, with low challenger name recognition limiting Evans to single digits. Historical incumbency advantages in low-turnout primaries further solidify his position, as Idaho Republicans rarely oust established figures. Upsets would require a late scandal, major endorsement shift, or unforeseen health issue, though no such catalysts have emerged.