Michael Katz maintains a dominant position in the Delaware Republican Senate primary, set for September 15, 2026, largely due to his endorsement by the state Republican Party and support from former party chair Julianne Murray. As a physician, former Democratic state senator, and 2024 independent U.S. Senate candidate, Katz brings prior elected experience and statewide name recognition that resonate in the closed primary. Challenger John Shulli, a retired Army colonel and U.S. Army War College instructor, emphasizes issues like border security and government accountability but lacks comparable institutional backing. Trader consensus reflects these structural advantages for Katz, with limited recent developments altering the trajectory ahead of the primary.