In 2002, Romney was vehemently attacked by his Pro-Choice Opponent, Shannon O’Brien about being weak on his “Pro-Choice credentials”. The Mass Citizens for Life endorsement was a major charge against him, and the Boston Globe went along with the accusations, and this whole thing culminated in that video that is going around Youtube now at the debate with Tim Russert. It was there that he made his famous Personally Pro-Life, Pro-Choice statement, and advocated a Moratorium on Abortion Law changes during his Governorship. (Which he followed throughout his tenure) I dont remember hearing much about Abortion after that, but that was after O’Brien was revealed to have switched her position from Pro-Life to Pro-Choice when she ran for Statewide office in the early 90’s. (Before then she was a Pro-Life catholic State Rep) Thus she couldnt really go after him anymore.
Thankfully Romney's radical pro-abortion running mate, Kerry Healey, came to Romney's defense, declaring "There isn't a dime of difference between Mitt Romney's position on choice and Shannon O'Brien."
Of course in 1994 Ted Kennedy similarly questioned Mitt's pro-abortion credentials, and Mitt attacked Ted Kennedy for once being pro-life, pointing out that he (Mitt) had been consistently pro-abortion for over 30 years.