The general election matchup in the New Hampshire Senate race is set. Decision Desk HQ has projected U.S. Senate candidate John E. Sununu won the Republican primary and U.S. Representative Chris Pappas (NH‑01) won the Democratic primary, meaning voters will see Sununu vs. Pappas for the open seat being vacated by U.S. Senator Jeanne Shaheen. This contest just moved from a story to a national test of Senate control — and both sides know it.
Decision Desk HQ Projects Sununu, Pappas for November
John E. Sununu carried the GOP primary decisively, getting roughly 70.2% of the vote to former Sen. Scott Brown’s roughly 25.4%. On the Democratic side, Chris Pappas cleared the field with about 62.1% against Karishma Manzur’s roughly 36.2%. Those margins give each campaign breathing room — but in New Hampshire, breathing room can evaporate fast when national money flows in.
Primary Numbers, Endorsements, and the Panic Button
Sununu had a big boost from President Donald Trump’s endorsement and heavy conservative outside spending. Name recognition and a Sununu family brand in New Hampshire helped too. Pappas won despite an eleventh‑hour Vice President Kamala Harris endorsement, and his campaign has been blunt enough to admit trouble — the “We’re losing” fundraising email didn’t exactly inspire calm among Democrats.
Why This Race Matters: Money, Polls, and Senate Control
This is no local footnote. Inside Elections recently moved the contest to Toss Up, and national super‑PACs have already parked money on the map. Reports show conservative groups and the Senate Leadership Fund lining up ad buys favoring Sununu, while Democratic groups have been slower to match the spending. Polls from Granite State and Saint Anselm offered a split picture in August, which explains the frantic tone from the left.
What Republicans Should Do Now
Republicans should treat New Hampshire like the prize it is. Sununu’s name and a Trump nod give the GOP an early edge, but campaigns win in fall with organization, crisp messaging, and targeted ad buys — not just headlines. Pappas will try to nationalize the race and plead for cash; conservatives should push a simple contrast on border security, the economy, and radical Democrat priorities. If the GOP plays it smart, this seat is one we should keep in the “must‑win” column — and the Democrats’ panic would make for a nice soundtrack.

