Michael Katz holds a commanding lead in the Delaware Republican Senate primary as traders assess his prior service as a state senator and name recognition from multiple statewide bids, including an independent run in 2024, against John Shulli's more recent entry as an instructor at the U.S. Army War College. With the September 15 primary still months away and limited campaign activity reported through late May, the 76-20 implied probability split aligns with typical advantages for candidates with established Delaware political networks in an open race lacking an incumbent. Shulli's stronger early fundraising has not yet shifted the consensus, as primary voters in the small Delaware Republican electorate often favor familiarity in low-turnout contests.