Incumbent U.S. Senator Jim Risch commands overwhelming trader consensus at 97% to win Idaho's Republican Senate primary on May 19, driven by his three prior terms, strong fundraising, and historical incumbency advantages in the deeply conservative state where primaries often decide general election outcomes. Challenger Joe Evans, a low-profile analyst who filed after the February 27 deadline, trails at 2% amid no public polling, endorsements, or momentum-shifting developments in the past month. Absent major catalysts like a late scandal, health issues for the 83-year-old Risch, or unexpected voter turnout surges, the race remains firmly tilted toward the established incumbent ahead of early voting starting April 27.