John Sununu officially entered the U.S. Senate race in New Hampshire on Wednesday, hoping to reclaim a seat he lost nearly two decades ago and boosting the GOP's chances of regaining a foothold in a region overwhelmingly represented by Democrats.

Sununu, 61, is seeking the Republican nomination for the seat being vacated by U.S. Sen. Jeanne Shaheen, a Democrat who ousted him in 2008. His decision sets up a primary featuring two former senators: Republican Scott Brown, who represented Massachusetts before moving to New Hampshire and losing to Shaheen in 2014, has been running since June.

A recent poll of likely primary voters had Sununu well ahead of Brown by 23 points.

"Maybe you're surprised to hear that I'm running for the Senate again. I'm a bit surprised myself," Sununu

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