“You have made your voices heard and they were loud,” Cooper told supporters in the state capital of Raleigh.
“For too many people in North Carolina, the middle class was feeling like a distant dream,” while “the richest Americans were getting unimaginable wealth at our expense”, he told the crowd.
“Today you said this has to stop,” the Democrat added. “As your new United States Senator, I am ready to take that message to Washington and work to do something about it.”
Before his Senate run, Cooper, 69, served as the governor of North Carolina from 2017 to 2025 and was previously the state’s attorney general.
His campaign focused on lowering the cost of food and groceries, healthcare, energy and utilities, childcare, and housing.
Whatley, who was hand-picked by Trump for the Senate seat, had vowed to enact the president’s agenda in the Senate, fight illegal immigration and roll back Democratic policies.
Tillis, North Carolina’s outgoing senator, chose not to run for a third six-year term after voting against the president’s domestic policy package – dubbed the One Big Beautiful Bill Act – in a break from his Republican Party.
After the vote, Trump criticised Tillis and threatened to support other candidates in his re-election bid, calling him “a talker and complainer”.
North Carolina’s other sitting senator, Ted Budd, who was elected to his first six-year Senate term in 2023, is also a Republican.
