From Survey USA (seems to be slicing it pretty thin, but fwiw):

Today Romney gets 31% among those in favor of stem-cell research. Romney’s debate answer on this question — so scholarly that moderator Chris Matthews momentarily thought Romney had mis-heard the question — appears to have resonated. But at the same time, Romney’s stem-cell answer has not cost Romney support among pro-life voters. Romney gets 38% among pro-life voters today, 19 points higher than McCain, 22 points higher than Giuliani and 26 points higher than Thompson, who are clustered far back. Among the 60% of NH Primary voters who say they are Conservative, Romney gets 35% today, 15 points better than McCain, 18 points better than Giuliani, 21 points better than Thompson. Giuliani’s support skews young. McCain’s support skews old. Romney’s support is even across all age groups. Because SurveyUSA’s questionnaire in January did not explicitly name Thompson, SurveyUSA does not here produce tracking graphs, since an exact, apples-to-apples track, is not possible. However, you may access the 1/29/07 New Hampshire data here.