John E. Sununu holds a dominant position in the New Hampshire Republican Senate primary due to President Trump’s February endorsement, his prior service representing the state in Congress and the Senate, and strong backing from party organizations and conservative leaders. Recent polling aggregates show him leading Scott Brown by 35 points or more among likely primary voters, supported by a substantial fundraising edge and family political ties within the state. Brown, a former Massachusetts senator and Trump ambassador, emphasizes his experience and independence but has not closed the gap despite public criticism of Sununu’s decision to skip recent debates. Minor candidates including Dan Innis have withdrawn or endorsed Sununu. With the September 8 primary days away, a shift would require a major late development such as an unforeseen scandal or health event affecting the frontrunner.