Trader consensus on Polymarket favors Army Col. John Shulli at 57.5% implied probability to win Delaware's closed Republican U.S. Senate primary on September 15, ahead of physician Michael Katz at 37%, driven by Shulli's lifelong GOP ties, 28 years of military service including Pentagon AI policy work, and appeal to conservative primary voters emphasizing economic renaissance via AI and nuclear energy. Katz, a former Democratic state senator (2009-2013) who ran independently in the 2024 Senate race garnering just 3.9%, faces skepticism over his recent party switch despite recent filings by both candidates in early April solidifying the two-person field. No polls, endorsements, or fundraising data have emerged in the past 30 days, with the July 14 filing deadline looming as a potential catalyst for shifts.