The latest release from the Political Research Center at Suffolk University, which is doing tracking polls on the New Hampshire primary, says that Rick Santorum has dropped all the way to fifth place – behind John Huntsman and Newt Gingrich – while Mitt Romney’s commanding lead is dwindling a bit.

For the fourth day in a row, Mitt Romney has fallen in overnight tracking, and Rick Santorum has dropped into fifth place among likely voters in the Jan. 10 New Hampshire Republican presidential primary, according to the latest Suffolk University/7News two-day tracking poll.

Ron Paul is gaining on Romney, while Jon Huntsman has rallied into third place.

Romney dropped 4 percentage points overnight to 35 percent. The former Massachusetts governor still holds a 15 point lead, but his margin has declined by 8 percentage points since last Tuesday, when 43 percent of likely Republican voters backed Romney.

Romney is followed by Paul (20 percent), Huntsman (11 percent), Newt Gingrich (9 percent) and Santorum, who dropped another point to 8 percent overnight. Rick Perry and Buddy Roemer each had 1 percent with 15 percent undecided.

“It’s a New Hampshire primary, it’s January, and here we go again,” said David Paleologos, director of the Suffolk University Political Research Center in Boston. “Romney’s strategy of running out the clock is costing him margin, Huntsman is still fighting hard and beginning to rally, and New Hampshire is playing contrarian to Rick Santorum, the Iowa Caucus star of a week ago, who has dropped to fifth place.”

All of the field calls for the tracking on Saturday, Jan. 7 were completed prior to the 9 p.m. EST start time of the first of two debates this weekend.