Michael Katz holds an overwhelming edge in the Delaware Republican U.S. Senate primary, scheduled for September 15, due to endorsements from the state party, former Attorney General Julianne Murray, and multiple Republican legislators, alongside his prior service as a state senator and physician-business background that supports coalition-building appeals. John Shulli, a retired Army colonel and War College instructor, has drawn some backing including from Michael Flynn and limited legislative support, plus stronger personal fundraising through June, but trails significantly in institutional alignment within the closed primary electorate. With no major recent shifts or additional candidates gaining traction, trader consensus reflects Katz’s established party positioning as the decisive factor heading into the final weeks.