By Heather Haddon and Josh Dawsey 

NASHUA, N.H.--New Jersey Gov. Chris Christie traveled to New Hampshire on Thursday, his second trip in two months to an early presidential primary state that could play a key role in his potential bid for the Republican nomination.

Mr. Christie has campaigned in the state a half-a-dozen times since taking office in 2010, and made his early endorsement of GOP presidential candidate Mitt Romney here in 2011. He has built a network of contacts and now has two former aides working in the Granite State in prominent Republican Party roles.

Ostensibly, the campaign stop was meant as a boost for Walt Havenstein, a businessman running for governor whom Mr. Christie wants to win the Republican primary and take on Democratic incumbent Gov. Maggie Hassan. Mr. Christie is the chairman of the Republican Governors Association and travels the country campaigning for GOP candidates.

He appeared alongside Mr. Havenstein before an audience of about 100 workers at BAE Systems Inc., a defense contractor where Mr. Havenstein was once an executive.

"I'm going to be up here often to help Walt as much as I possibly can," Mr. Christie said during a short speech.

The events on Thursday also gave Mr. Christie a day in the limelight in New Hampshire, where his potential rivals for the GOP presidential nomination also have spent time. Sen. Rand Paul of Kentucky, Sen. Ted Cruz of Texas and Louisiana Gov. Bobby Jindal traveled here this year to make speeches, while Texas Gov. Rick Perry is set to visit in the next few weeks.

Mr. Christie's trips, before the results of a competitive GOP gubernatorial primary, have led some in New Hampshire to conclude he is testing his appeal for a 2016 presidential bid.

"I expect he's going to know his way around the state," said Tom Rath, a former Republican Party national committeeman for New Hampshire. "These would be people who would be prime targets for 2016."

As a northeastern Republican with a big personality and a love for retail politicking, Mr. Christie has drawn interest in a state famous for demanding personal contact from candidates.

"You have to get out of the limousine and you have to go [to] people's dining room tables and be able to take tough questions and know the price of a gallon of milk," said Neil Levesque, executive director of the New Hampshire Institute of Politics and Political Library at Saint Anselm College in Manchester. "We really test candidates."

Polls show that the 2016 field is wide open in New Hampshire.

A WMUR Granite State Poll in July found that 39% of likely Republican primary voters would choose Mr. Romney if he ran again, though he has said he won't. Mr. Christie and U.S. Rep. Paul Ryan of Wisconsin tied for second, each with 7% of the support.

Mr. Christie was the most polarizing of the candidates polled--attractive to moderates but not conservatives, said Andrew Smith, director of the University of New Hampshire Survey Center.

Mr. Christie has surrounded himself with aides who worked for Rudy Giuliani's 2008 presidential campaign, which focused on winning New Hampshire and Florida early, with little attention paid to more conservative states such as South Carolina. That strategy, however, sputtered.

Mr. Christie's aides said it was premature to discuss a game plan for the presidential nomination and played down any larger motives for the New Hampshire visits.

Josh Dawsey contributed to this article.

Write to Heather Haddon at heather.haddon@wsj.com

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