Michael Katz leads the Delaware Republican Senate primary with strong establishment backing, including endorsements from former U.S. Attorney Julianne Murray and multiple state legislators, plus prior service as a Democratic state senator and 2024 Independent Senate candidate. His physician and business background supports coalition-building messaging ahead of the September 15 primary. John Shulli, an Army colonel and War College instructor, draws support from figures like Michael Flynn and emphasizes military leadership and energy policy, yet trails in party organization alignment and fundraising. The two-week timeline to the closed primary leaves limited room for late shifts absent major developments. Trader consensus reflects Katz's structural advantages in a low-turnout contest.