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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 BachmannPawlenty opts out of Senate run in Minnesota US ambassador repeated debunked claim that Abedin has 'egregious' ties to Muslim Brotherhood Bachmann considering running for Franken's seat MORE, Rick Santorum and Rick Perry have also signed off on the personhood pledge, whereas Jon Huntsman has argued the platform "goes too far."