Michael Katz holds a commanding lead in the Delaware Republican Senate primary due to his endorsement by the state party committee at its April convention and backing from prominent figures including former U.S. Attorney Julianne Murray and multiple state legislators. His prior service in the Delaware Senate, combined with business and medical experience, has helped build a coalition spanning Republicans, independents, and some Democrats in the low-turnout primary scheduled for September 15. John Shulli, a retired Army colonel and War College instructor, has secured fewer institutional endorsements and trails in trader-implied probability despite recent fundraising. A late surge by Shulli would require unusually high military-focused turnout or unexpected shifts in party support, both considered low-probability scenarios given the current consensus reflected in market pricing.