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Chris O'Meara, File, Associated Press
FILE - In this Sept. 12, 2011, file photo Republican presidential candidates, from left, Rep. Michele Bachmann, R-Minn, former Massachusetts Gov. Mitt Romney and Texas Gov. Rick Perry cover their hearts during the playing of the National Anthem before a Republican presidential debate in Tampa, Fla. As a presidential candidate four years ago Romney faced relentless criticism for changing his positions on abortion and gay rights and equivocating on other policy issues, like immigration and gun control. Thus far this time he has largely escaped such attacks, but that may be changing.

LONDONDERRY, N.H. — The full slate of Republican presidential candidates is descending upon New Hampshire for the first time.

They will fight to showcase their differences in a Tuesday night debate at Dartmouth College. And some will spend the days before and after the debate visiting the Granite State's diners and corner stores as well as hosting town hall-style meetings.

Three months before voting begins, new polling suggests the race is more competitive than it may appear.

A WMUR Granite State poll released late Friday says that former Massachusetts Gov. Mitt Romney is the choice of 37 percent of likely New Hampshire primary voters. Georgia businessman Herman Cain finished a distant second with 12 percent.

But only 11 percent said they have definitely settled on a candidate.