Gov. Nikki Haley said again this week she would not accept the vice presidential slot if it were offered to her.

Haley endorsed and campaigned for former Massachusetts Gov. Mitt Romney, whom many expect will become the Republican presidential nominee, and she has been mentioned as a possible No. 2 on the GOP ticket.

“I’d say, ‘Thank you, but no,’ ” she told ABC News in a recent interview. “I made a promise to the people of this state. And I think that promise matters. And I intend to keep it.”

Haley’s answer echoed her previous pledges — which she began making at least as far back as May 2011 — not to consider serving as someone’s running mate.

Rob Godfrey, Haley’s spokesman, said Monday, “As she has said time and again, she loves being governor of South Carolina; she is grateful for the chance the people took on her; and she looks forward to continuing to deliver results for the state.”

University of Virginia political scientist Larry Sabato said Haley’s name has arisen as a possible vice presidential pick, but despite her youth, energy and tea party backing, her selection would be a surprise.

“South Carolina is already guaranteed for Romney,” Sabato said Monday. “Haley is not especially popular in the state, and her short stint in high office would look like Sarah Palin all over again.”

Sabato noted there are a few dozen GOP vice presidential contenders out there, and his online publication, Sabato’s Crystal Ball, will review them next week.

“Haley will not be among them,” Sabato said.

Still, CNN Chief Political Correspondant Candy Crowley also mentioned Haley in her recent story about possible veep picks.

Crowley mentioned Florida Sen. Marco Rubio who, like Haley, has said he would not consider the No. 2 post.

“They almost always say things like that,” Crowley wrote. “Until they say yes.”

The full interview with Haley airs on ABC’s “Nightline” at 11:30 tonight.

Reach Robert Behre at 937-5771.