A second New Hampshire poll in less than a month shows former Massachusetts Gov. Mitt Romney pulling ahead of former front-runners John McCain and Rudy Giuliani and into first place in the leadoff Presidential primary campaign.

The American Research Group's June 27-30 poll of 600 likely Republican primary voters has Romney with the support of 27 percent of those surveyed, compared to 21 percent for McCain and 19 percent for Giuliani.

A month ago, the same poll showed Romney trailing McCain, 30 to 23 percent and in a virtual tie with Giuliani, who received the support of 21 percent.

The new poll also shows that among 600 likely Democratic primary voters, New York Sen. Hillary Clinton continues to lead the Democratic pack with 34 percent, unchanged since May, but that Barack Obama has moved ahead of John Edwards and into second place, with the support 25 percent of those polled. Edwards was backed by 18 percent of those polled in May, while Obama in May was backed by 15 percent. The June poll shows Edwards at 15 percent.

Both party polls have margins of error of 4 percent.

In the new Republican poll, former Tennessee Sen. Fred Thompson jumped from 3 percent in May to 10 percent, apparently taking support from McCain and Giuliani.

Thompson, who visited the state last week as the poll was being taken, is not yet a candidate, but has strongly hinted that he will run.

Former House speaker Newt Gingrich, who is also not a candidate, drew 4 percent, the same percentage as in May, while Sam Brownback, Mike Huckabee, Duncan Hunter, Ron Paul, and Tom Tancredo received 1 percent each, and 14 percent were undecided.

Romney led among self-described Republicans with 29 percent, compared to 21 percent for Giuliani and 18 percent for McCain. Among independents, McCain led with 29 percent, while Romney followed with 22 percent and Giuliani 19 percent.

In the Democratic poll, New Mexico Gov. Bill Richardson headed the second tier with 6 percent, while Joe Biden received 4 percent, Dennis Kucinich received 3 percent, Mike Gravel received 2 percent, non-candidate Wesley Clark 1 percent, and 11 percent were undecided.

Clinton led among Democrats with 35 percent, compared to 25 percent for Obama and 11 percent for Edwards. She also led among independents, drawing 33 percent compared to 26 percent for Obama and 12 for Edwards.

Romney's growing strength in New Hampshire was first indicated in mid-June, when a poll conducted by UNH for CNN and WMUR showed him pulling into the GOP lead, with 28 percent, compared to 20 percent for Giuliani and 20 percent for McCain.

The UNH Democratic poll had Clinton leading Obama, 36 to 22 percent, with Edwards at 12 percent.