Michael Katz holds a commanding lead in the Delaware Republican Senate primary, scheduled for September 15, 2026, driven by his endorsement from the state Republican Party, former U.S. Attorney Julianne Murray, multiple state legislators, and the Independent Party of Delaware. As a former Democratic state senator with medical, business, and legislative experience, Katz benefits from established party infrastructure and a broad coalition that includes crossover appeal in a heavily Democratic state. John Shulli, a retired Army colonel and War College instructor, has emphasized military leadership and policy priorities such as energy independence but trails in organizational support. With the primary days away, trader consensus reflects Katz’s structural advantages, though a late mobilization of veteran or grassroots voters could still narrow the margin.