In the low-salience 2026 Delaware U.S. Senate contest, incumbent Democrat Chris Coons faces Republican Michael Katz in a race rated Solid Democratic by forecasters, with no general election polls yet available. Traders have clustered probabilities on the 325K–425K turnout ranges because the contest lacks statewide competitiveness or national flashpoints that typically drive higher participation in midterm elections. Limited campaign intensity ahead of the September 15 primary, combined with Delaware’s modest eligible voter base and standard historical midterm patterns, supports moderate engagement levels. Democratic registration advantages and expanded early voting options provide a baseline, while the absence of other high-profile races on the ballot keeps mobilization signals muted. Upcoming primary results or late national developments could still influence final turnout before November 3.