Manchester, New Hampshire (CNN) - Mitt Romney's campaign is rolling out the endorsements of two New Hampshire sheriffs as the former Massachusetts governor spends the week campaigning in far-flung states, CNN has learned.
Sheriffs Wayne Estes and Gerald Marcou will endorse Romney Monday, joining five other sheriffs who have already backed the former governor.
There are 10 sheriffs in New Hampshire, one for every county.
The endorsements underline Romney's newly aggressive efforts in the nation's first primary state, and come days after the former governor fanned out with volunteers to knock on voters' doors here. Romney is now heading cross-country and will hold a campaign event with grass-roots supporters Tuesday in Arizona.
Later in the week, Romney heads to Iowa to campaign Friday before participating in a GOP debate Saturday in Des Moines, according the a campaign source.
An NBC News/Marist poll released Sunday found support for former House Speaker Newt Gingrich had continued to grow in the nation's first caucus state, with Romney in a statistical tie for second there alongside Texas Rep. Ron Paul.
In a visit to New Hampshire on Saturday, Romney told members of the media that Iowa could factor into his family's holiday plans.
"We don't know where we're going to be for Christmas," he said. "The options are New Hampshire, Iowa or Belmont, Massachusetts. And maybe some I haven't thought of yet."
The Romney family owns homes in New Hampshire and in Belmont, a suburb of Boston.
Romney said he would like to win Iowa and would continue to campaign there as well as in New Hampshire and South Carolina, which also host early contests.
"I'd like to win them all," he said. "I don't think that's extremely likely, but I hope to do very well in all the states and get enough support to show that we're serious and that we intend to take back the White House."
Romney has spent less time in Iowa than many of his competitors but opened a campaign office in the state last month.