David Brock Smith leads the Oregon Republican U.S. Senate primary as a sitting state senator from District 1, drawing on established party ties and name recognition ahead of the May 19 vote. Jo Rae Perkins, who previously won the nomination in 2020 and 2022 before general-election defeats, holds steady support among core voters but trails in broader party consolidation. The remaining candidates register minimal traction in a field that closed filings months earlier. Recent campaign announcements and candidate questionnaires have reinforced Smith's organizational advantages without introducing new polling shifts or endorsements that would alter the current trader consensus reflected in these probabilities.