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New Hampshire primary kicks off battle for one of nation's key open Senate seats

A late progressive surge has tightened the Democratic Senate race, while Republicans weigh a Sununu-Brown contest that could shape November’s matchup.

  • Voters head to the polls today across New Hampshire to nominate candidates for the Senate seat vacated by retiring Democratic Senator Jeanne Shaheen, with Representative Chris Pappas facing Karishma Manzur in the Democratic primary and Former Sen. John E. Sununu competing against Scott Brown for the Republican nomination.
  • The contest became open after Shaheen announced her retirement last year, creating a wide-open race in a state that has consistently backed Democrats in federal elections but remains a closely divided political battleground.
  • Frontrunner Pappas holds a 59 percent to 28 percent lead over Manzur in August polling, while Sununu, who has $17 million in support from a Republican Senate super PAC, is expected to easily win his primary.
  • Democrats view the seat as essential to maintaining their path toward controlling the Senate, though Republicans believe Sununu's candidacy could make the general election competitive in a state that narrowly backed Kamala Harris in 2024.
  • With 351,815 voters currently unaffiliated, independents will be key to victory in this purple state, forcing candidates to court them in a high-stakes general election that will help determine Senate control.
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New Hampshire goes to the polls in primary for key open Senate seat

Incumbent Sen. Jeanne Shaheen, D-N.H., will retire when her term ends in January.

·Englewood Cliffs, United States
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The Conway Daily Sun broke the news on Monday, September 7, 2026.
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