Raymond McKay holds an 88% implied probability on Polymarket as the trader consensus Republican nominee for Rhode Island's U.S. Senate primary on September 8, 2026, reflecting his status as the sole viable contender against perennial candidate Allen Waters in a low-turnout contest dominated by party organization. McKay, a former Rhode Island Republican State Central Committee member who ran in the 2024 GOP primary, benefits from Waters' history of unsuccessful bids—including a 2020 Senate run disavowed by state party leaders—and his February 2026 launch of an independent Providence mayoral campaign, with recent promotions signaling divided focus. Absent recent polling or endorsements, traders price in McKay's dominance, though late entries or shifts could influence the outcome.