Michael Katz holds a strong lead in the Delaware Republican Senate primary due to his prior service as a Democratic state senator and his 2024 independent U.S. Senate bid, which provide established name recognition in a low-visibility race. John Shulli, a retired Army colonel and current instructor at the U.S. Army War College, entered the contest earlier this year but trails in trader assessments. With the September 15 primary still months away and only these two candidates filed, the market reflects Katz's structural advantages in Delaware Republican circles. No major recent developments have altered the positioning, leaving the outcome sensitive to any late endorsements, fundraising shifts, or additional entrants before filing deadlines close.