John E. Sununu holds a dominant position in the New Hampshire Republican Senate primary due to his established name recognition as a former U.S. senator from the state, a recent Trump endorsement, and a substantial fundraising edge that has widened his polling lead. A University of New Hampshire survey from April 2026 showed Sununu at 56 percent support among likely Republican primary voters compared to 19 percent for Scott Brown. Sununu also maintains a strong cash-on-hand advantage exceeding $1.8 million. Dan Innis suspended his campaign earlier and endorsed Sununu, while Chris Sununu has not entered the race. The September 8 primary remains several months away, leaving room for shifts driven by additional endorsements, debates, or changes in voter turnout among Republican primary participants.