CONCORD, N.H. (AP) — Republican John E. Sununu and Democrat Chris Pappas will compete for an open U.S. Senate seat in New Hampshire in a race that has emerged as one of a handful around the country that could determine control of the chamber in November.

Sununu, a former U.S. senator, and Pappas, a member of the U.S. House, are vying to replace U.S. Sen. Jeanne Shaheen, whose decision not to seek reelection created a cascade of competitive races. Both entered their respective party primaries as strong front-runners and now have just eight weeks to make their case to general election voters.

Republicans view the seat as an opportunity to regain a foothold in a region long dominated by Democrats in Congress. Democrats, meanwhile, need a net gain of four seats to retake the chamber, and keeping New Hampshire in their column is a critical part of that effort.

In other top races, Anthony DiLorenzo won the Republican primary for the 1st Congressional District, while Lily Tang Williams won the GOP primary in the 2nd District, where she’ll face U.S. Rep. Maggie Goodlander, a Democrat seeking a second term.

Still outstanding were the results in the Democratic primary for the 1st District, where the candidates included Shaheen’s daughter, Stefany Shaheen, and retired Marine Maura Sullivan.

Familiar names will compete in November for open Senate seat

Pappas, who is giving up his seat in the 1st Congressional District after four terms, defeated four other candidates, including democratic socialist Karishma Manzur, who had been gaining on him in recent weeks.

Speaking to supporters at his family's restaurant in Manchester, he quickly sought to link Sununu to President Donald Trump, who endorsed Sununu even though Sununu called him “a loser” during the 2024 presidential campaign.

“While New Hampshire families are struggling to make ends meet, John Sununu has thrown his lot in with Donald Trump and supports the policies that cater to big corporations and billionaires while they make life harder for Granite Staters,” said Pappas, whose campaign also quickly posted a negative ad on social media calling Sununu “a sequel we can't afford.”

“We've got to turn the page on Donald Trump's reckless leadership, on corruption, on the rigged economy and on costs, and this is not the time to turn it back to a failed politician from the past," he said at his victory party.

Sununu, who spent six years in the U.S. House and one term in the Senate before being ousted by Shaheen in 2008, called Pappas a career politician who has held office for virtually his entire adult life.

“He’s not an independent voice for New Hampshire,” Sununu said at his victory party at a Manchester ski area. “Chris Pappas has three main qualities: ineffective, partisan and out of touch with New Hampshire.”

Sununu defeated seven other Republicans to win the primary, including former U.S. Sen. Scott Brown, who accused him of coasting on his name. Sununu's father and younger brother are both former governors.

Jim Loomis, 83, of Bow, said he backed Brown in 2014 but not on Tuesday because “he never got traction back again.” He acknowledged Sununu had been out of politics for even longer but still voted for him.

“I think what he’s done for work over the years has kept him close enough to what’s going on, and then with his family ties, I just think he’s got a more stable base,” Loomis said.

Democrats in tight contest for 1st District nomination

Stefany Shaheen and Sullivan were the leading candidates among seven seeking the Democratic nomination in the 1st District.

Shaheen is a former city councilor in Portsmouth. She founded a business to help people with chronic medical conditions after one of her daughters was diagnosed with Type 1 diabetes. She also is part of a bio-tech initiative in New Hampshire to advance regenerative medicine.

Sullivan is a retired Marine and Iraq War veteran who served as an assistant secretary at the Department of Veterans Affairs under President Barack Obama. A vice chair of the New Hampshire Democratic Party, Sullivan ran for the 1st District seat in 2018, losing in an 11-candidate primary to Pappas in his first congressional bid.

On the Republican side, political newcomer DiLorenzo, who owns a chain of car dealerships and has been endorsed by Trump, won the Republican primary. He defeated three other candidates, including Hollie Noveletsky, a veteran and nurse practitioner who runs a steel fabrication company and ran for the same seat two years ago.

In the 2nd District, first-term incumbent Goodlander overcame a primary challenge from Paige Beauchemin, a progressive state lawmaker and nurse. Tang Williams, who was the nominee two years ago and was making her third attempt at the seat, won the Republican primary.

Incumbent Ayotte defeats 2 challengers in GOP primary for governor

In contrast to the all-Democratic congressional delegation, Republicans dominate state government.

Republican Gov. Kelly Ayotte defeated two little-known opponents in her primary as she seeks a second two-year term. Cinde Warmington, a healthcare attorney, was unopposed for the Democratic nomination.

Voters also were nominating candidates for the entire state Legislature, where Republicans hold a roughly 40-vote majority in the 400-member House and outnumber Democrats in the Senate 16-8.

Accustomed to going first when it comes to presidential primaries, New Hampshire is among the last states to hold state-level primary elections. But legislation passed this year moves future state primaries to the second Tuesday in June.