Ms. Shaheen’s retirement will set off a high-stakes fight for an open seat in a state where she has been a leading political figure for decades.

Jeanne Shaheen of New Hampshire announced Wednesday that she will not be running for reelection to the U.S. Senate in 2026. "Today, after careful consideration, I am announcing that I have made the difficult decision not to seek reelection to the Senate in 2026,

Democratic Sen. Jeanne Shaheen of New Hampshire announced Wednesday that she will not seek reelection in 2026, a decision that will bring an end to the senator’s historic career in Congress and sets up a competitive race for the Senate seat in the Granite State.