David Roth's 91% implied probability in the Idaho Democratic U.S. Senate primary reflects trader consensus on his operational edge, including prior statewide campaigns building name recognition, endorsements from Madison County Democrats and the University of Idaho Federation of Teachers, and superior fundraising supporting get-out-the-vote efforts in a low-turnout contest open to independents. With no public polls available and the May 19 primary eight days away, Brad Moore and Nickolas Bonds trail due to limited visibility and infrastructure. Upsets remain possible via a late state party endorsement shift, scandal, or unexpected turnout surge among unorganized voters, though structural barriers favor Roth's position.