New Hampshire Primaries Set Stage for Key Senate Races

New Hampshire voters headed to the polls on Tuesday, September 8, 2026, to cast their ballots in primary elections that will determine nominees for Senate, House seats, and governor. The most closely watched contest is the Democratic primary for the U.S. Senate seat being vacated by incumbent Jeanne Shaheen. Representative Chris Pappas, considered the frontrunner, faces a challenge from Karishma Manzur, a scientist and member of the Democratic Socialists of America. Manzur has criticized Pappas for his support of Israel and funding from pro-Israel groups, while Pappas has defended the U.S. alliance with Israel and expressed concerns about current Israeli leadership. In the Republican Senate primary, former Senator John E. Sununu is competing against former Senator Scott Brown. Sununu, who previously held the Senate seat from 2003 to 2009, has received an endorsement from former President Donald Trump. Brown also has significant name recognition, having served in the Senate representing Massachusetts and as an ambassador. The Sununu name carries considerable political weight in New Hampshire, with his father and brother also having served as governors.