Former U.S. House Speaker Newt Gingrich is currently riding high among voters likely to attend the Minnesota Republican caucuses Feb. 7.

According to the poll, conducted Jan. 21-22 by Public Policy Polling among 303 likely caucus-goers, 36 percent support Gingrich, with former Massachusetts Gov. Mitt Romney getting 18 percent, former U.S. Sen. Rick Santorum getting 17 percent and U.S. Rep. Ron Paul of Texas getting 13 percent.

But those numbers are "fluid," the pollster said. Fifteen percent said they were undecided and more than 60 percent of respondents said they could change their minds.

Although Romney has high-profile Minnesota backers, including former Gov. Tim Pawlenty, the pollster found that Romney supporters are "least loyal." Of the 37 percent who are "strongly committed to a candidate," only 27 percent are Romney supporters, 39 percent are Gingrich supporters, 39 percent are Paul supporters and 46 percent are Santorum supporters.

Santorum is also the second choice of 21 percent, picking up the most support from Gingrich backers.

If the race narrows to just Gingrich and Romney, half of Minnesota Republicans support Gingrich and 29 percent pick Romney.

The poll had a margin of error of plus or minus 5.6 percentage points.