John E. Sununu holds a commanding lead in the New Hampshire Republican Senate primary due to his prior service in the seat, high name recognition within the state’s political network, and consistent polling advantage over Scott Brown heading into the September 8 contest. Sununu’s emphasis on fiscal discipline and practical governance has aligned with primary voter priorities, supported by stronger fundraising and limited organized opposition. Brown remains the only other notable contender, highlighting differences on economic and foreign policy issues in recent debates, yet trails significantly in surveys. Minor candidates Chris Sununu and Dan Innis register negligible support. Late developments such as a major endorsement shift, unexpected turnout surge, or unforeseen controversy could still alter the outcome before primary day.