John E. Sununu holds a commanding lead in New Hampshire’s Republican U.S. Senate primary due to strong name recognition from his prior Senate service representing the state and his family’s long-standing political prominence, including his brother Chris Sununu’s recent governorship. Recent polling shows him ahead of Scott Brown by roughly 30 points or more, supported by superior fundraising and broad party backing, including an endorsement from President Trump. Brown, a former Massachusetts senator and ambassador, has positioned himself as an independent voice but trails significantly in surveys and resources. Minor candidates such as Dan Innis, who withdrew and endorsed Sununu, and others have not mounted competitive challenges. With the September 8 primary just days away, the market’s near-certainty reflects Sununu’s consistent dominance in voter surveys and organizational advantages; a late shift would require an unforeseen development such as a major scandal or turnout surprise to alter the outcome.