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LUTZ, Fla. — As former House speaker Newt Gingrich courts evangelical voters in advance of Tuesday’s Florida primary, he is drawing an increasingly hard line against the use of embryonic stem-cell research — a position that contrasts not only with that of former Massachusetts governor Mitt Romney, but also with statements that Gingrich himself has made on the subject in the past.

Speaking at a Baptist church in Winter Park on Saturday, the former speaker received a standing ovation when he declared that embryonic stem-cell research amounts to “the use of science to desensitize society over the killing of babies.”

And in a news conference Sunday, he said he would ban all embryonic stem-cell research, including that done on discarded embryos created by in vitro fertilization.

Gingrich added that he would also create a commission to study the ethics of in vitro fertilization, which has involved the creation of hundreds of thousands of excess embryos stored or discarded by fertility clinics.

“I believe life begins at conception, and the question I was raising was what happens to embryos in...