Michael Katz holds a commanding lead in the Delaware Republican U.S. Senate primary, scheduled for September 15, 2026, due to his endorsement by the Delaware Republican Party at its April convention, along with support from former U.S. Attorney Julianne Murray and multiple state legislators. His background as a former state senator, physician, and business owner provides established name recognition and a coalition-building profile suited to the state's Democratic lean. John Shulli, a military veteran and instructor at the U.S. Army War College, has focused his campaign on national security and energy issues but trails in fundraising and high-profile backing. With the primary days away, trader consensus reflects Katz's structural advantages in a low-turnout contest; late developments such as turnout shifts or unforeseen events would be required to alter the outcome.