Michael Katz holds a strong lead in the Delaware Republican U.S. Senate primary, scheduled for September 15, 2026, due to broader party organizational support, a larger fundraising edge with substantially higher cash on hand, and endorsements from multiple state legislators, county party leaders, and former officials. His background as a former Democratic state senator who later ran as an Independent provides established name recognition and legislative experience, which traders view as assets in consolidating Republican primary voters. John Shulli, a military veteran and instructor at the U.S. Army War College, maintains a narrower base anchored by select conservative endorsements but trails in resources and institutional backing. Early voting through September 13 and the compressed timeline to election day reinforce the current market positioning ahead of certification.