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Gingrich's record on abortion has been mixed. During the campaign, he signaled support for a "personhood" pledge that would afford human embryos all the legal protections of a person. In the 1990s, however, Gingrich said he would consider exemptions in instances of rape, incest or potential harm to the mother.

The topic has been an especially touchy one for Gingrich. A pro-Mitt Romney political action committee released an ad late last month insinuating that Gingrich supported taxpayer funding of abortions, a claim Gingrich has disputed.

Rivals Michele BachmannMichele Marie BachmannTom Petty dies at 66 Bachmann: Muslim immigrants trying to undermine Western civilization Religious leaders pray over Trump in Oval Office MORE, Rick Santorum and Rick Perry have also signed off on the personhood pledge, whereas Jon Huntsman has argued the platform "goes too far."