Incumbent U.S. Senator Jim Risch commands 97.4% trader consensus to win Idaho's closed Republican Senate primary on May 19, driven by his multi-term tenure, superior fundraising—outpacing challengers per February reports—and historical incumbency advantages in the deep-red state's low-turnout GOP contest. Recent candidate filings by the March 6 federal deadline confirmed Joe Evans as Risch's primary opponent, with minimal polling or momentum shifting odds. North Idaho businessman Denny LaVé's April 2 entry has yet to register on markets. While late scandals, health issues, or a high-profile endorsement could theoretically challenge Risch, such disruptions remain improbable absent major catalysts before early voting begins April 27.