Representative Chris Pappas, a four-term congressman, won the New Hampshire Democratic Senate primary on September 8, 2026, defeating progressive challenger Karishma Manzur, according to The Associated Press. Pappas, 46, who represents the state's First District, will face Republican nominee John E. Sununu in the general election.
Pappas's victory positions him to potentially influence the balance of power in the U.S. Senate, as the seat was vacated by retiring Senator Jeanne Shaheen, who endorsed Pappas. Recent polling indicated that Pappas was trailing Sununu in a general election matchup. Sununu won his primary against Scott Brown on the same day.
The Senate Leadership Fund, a Republican super PAC, has committed to spending $17 million in the state for the general election, while the Senate Majority PAC, a Democratic counterpart, plans to spend $10.2 million on television advertising.
Pappas has been a prominent figure in New Hampshire politics, previously serving on the state's Executive Council and as treasurer of Hillsborough County. If elected, he would be the first openly gay male senator. His campaign has raised over $15 million, significantly outpacing Manzur, who raised less than $500,000. Pappas received endorsements from notable figures including former Vice President Kamala Harris and Senators Elizabeth Warren and Mark Kelly.
Manzur, a member of the Southern New Hampshire Democratic Socialists of America, attempted to position Pappas as part of a political establishment that has not adequately addressed issues affecting everyday citizens, such as healthcare access and food affordability.