Michael Katz holds a strong lead in the Delaware Republican Senate primary market due to his recent endorsement by the state Republican Party, which positions him as the preferred nominee ahead of the September 15, 2026, vote. As a former Democratic state senator who later affiliated with the Republicans after an independent Senate bid in 2024, Katz benefits from established name recognition and party infrastructure in a low-turnout primary. John Shulli, a U.S. Army War College instructor and colonel with a military background, trails despite higher fundraising totals, reflecting limited early organizational support. Trader consensus reflects these institutional and biographical factors, with the race remaining open to shifts from additional endorsements, debate performances, or late campaign momentum before the primary.