COLUMBIA, South Carolina (CNN) – Former Massachusetts Gov. Mitt Romney's presidential campaign recently sent out a slick mail piece in South Carolina emphatically stating that Romney is "the only major presidential candidate who supports the Republican party's pro-life platform: A constitutional amendment banning abortion nationwide."

But the claim doesn't completely square with Romney's previous statements that the abortion issue should first be decided by state legislatures before a constitutional amendment can be passed, leading one conservative leader in the state to call parts of the Romney brochure "oversimplified" and "offensive."

Romney's claim in the mailer, obtained last week by CNN, also opened the door for three of his Republican opponents campaigning in South Carolina to hammer Romney on his past support for abortion rights.