David Roth dominates trader consensus at 88.5% implied probability to win the Idaho Democratic U.S. Senate primary on May 19, reflecting his established campaign infrastructure, prior 2022 nomination experience, and active outreach as a business leader and DNC member targeting rural voters. Challengers Brad Moore and Nickolas Bonds trail at 4.5% and 3.9%, hampered by limited visibility and fundraising in Idaho's low-turnout Democratic primary. Recent candidate filings finalized in early April confirmed the three-candidate field without major endorsements or polling to challenge Roth's lead, leaving traders pricing in minimal upset risk barring late-breaking developments like scandals or surges in early voting data.