GOP presidential hopeful Mitt Romney and the anti-abortion rights group The Susan B. Anthony List (SBA List) engaged in a war of words Saturday over Romney’s refusal to sign an SBAList anti-abortion pledge.

Romney penned an opinion piece on the National Review’s website Saturday explaining his refusal to sign the pledge, which SBAList notes has been signed by competitors Michele Bachmann, Newt Gingrich, Ron Paul, Tim Pawlenty and Rick Santorum.

Romney, the former governor of Massachusetts says he is against abortion rights and wants to see Roe v. Wade overturned. He says he also wants to cut all federal funding to Planned Parenthood, which provides abortions but does not use federal funding to do so.

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