Delaware’s Republican U.S. Senate primary on September 15 features Michael Katz, a physician, former Democratic state senator, and 2024 Independent candidate, against military veteran John Shulli. Katz secured the Delaware Republican Party’s convention support and a July endorsement from former state GOP chair and U.S. Attorney Julianne Murray, bolstering his coalition-building pitch in a closed primary. These developments, alongside Katz’s legislative and business experience, have consolidated trader expectations around his frontrunner status. Shulli highlights his 28-year Army career and policy priorities like energy independence but trails in party alignment. With the vote weeks away and scant public polling, the 86-14 market split reflects establishment momentum rather than guaranteed results.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedDelaware Republican Senate Primary Winner
$35,356 Vol.
$35,356 Vol.

Michael Katz
86%

John Shulli
14%
$35,356 Vol.
$35,356 Vol.

Michael Katz
86%

John Shulli
14%
If no 2026 Delaware Republican Senate Primary takes place, this market will resolve to "Other".
The resolution source for this market will be the first announcement of the results from the Delaware Republican party, however an overwhelming consensus of credible reporting may suffice.
Market Opened: Feb 25, 2026, 6:16 PM ET
Resolver
0x69c47De9D...If no 2026 Delaware Republican Senate Primary takes place, this market will resolve to "Other".
The resolution source for this market will be the first announcement of the results from the Delaware Republican party, however an overwhelming consensus of credible reporting may suffice.
Resolver
0x69c47De9D...Delaware’s Republican U.S. Senate primary on September 15 features Michael Katz, a physician, former Democratic state senator, and 2024 Independent candidate, against military veteran John Shulli. Katz secured the Delaware Republican Party’s convention support and a July endorsement from former state GOP chair and U.S. Attorney Julianne Murray, bolstering his coalition-building pitch in a closed primary. These developments, alongside Katz’s legislative and business experience, have consolidated trader expectations around his frontrunner status. Shulli highlights his 28-year Army career and policy priorities like energy independence but trails in party alignment. With the vote weeks away and scant public polling, the 86-14 market split reflects establishment momentum rather than guaranteed results.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated



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