Incumbent Sen. Jim Risch holds commanding 97% trader consensus to win Idaho's Republican Senate primary on May 19, reflecting his three-term record, superior fundraising, and entrenched support in the deep-red state where GOP primaries rarely upset established incumbents. Challenger Joe Evans, who filed by the February deadline, lacks notable polling traction or endorsements to mount a credible threat, with no significant developments shifting sentiment in recent weeks beyond routine campaign activity like Risch's April push for absentee ballots. While odds exceed 90%, late-breaking scenarios such as a major scandal, health issue, or unexpected endorsement defection could narrow the gap ahead of early voting.