Rhode Island's Republican primary for the U.S. Senate on September 9, 2026, shows Raymond McKay as the clear frontrunner in trader consensus because he maintains an active Senate-focused campaign with consistent fundraising and voter outreach. Allen Waters, the sole other candidate, has shifted recent efforts toward a U.S. House race, limiting his Senate-specific activity and reducing competitive pressure. This contrast in priorities and resources has driven the current market positioning, with no significant new endorsements, polling shifts, or procedural changes reported in the past month to alter the balance. The outcome will hinge on primary turnout among Republican voters in a state where the general election remains heavily Democratic-leaning.