Michael Katz holds an overwhelming edge in the Delaware Republican U.S. Senate primary scheduled for September 15, 2026, reflecting his formal endorsement by the state Republican Party at its April 2026 convention, prior service as a Democratic state senator, and 2024 independent candidacy for the same seat. These factors provide Katz with established name recognition and institutional support within the party apparatus ahead of the low-turnout primary contest. John Shulli, a retired Army colonel and War College instructor, has mounted a challenge emphasizing his military leadership and Delaware roots, yet trails significantly in trader assessments of primary dynamics. Recent statements from Katz on election integrity and fundraising patterns have further reinforced perceptions of his frontrunner status in the weeks leading into the vote.