GREENVILLE, S.C. (AP) — Texas Gov. Rick Perry says Mitt Romney changed his position on legalized abortion out of political convenience.Romney supported legalized abortion while Massachusetts governor. He says he changed his mind after weighing legislation that would have created new embryos to be destroyed.Perry told an anti-abortion forum in South Carolina on Wednesday that it's hard to understand how a public official could change his views on something as fundamental as abortion in his 50s.He says Romney made the decision "for political convenience."Perry and fellow presidential contenders Newt Gingrich, Rick Santorum and Ron Paul told the forum they believe human life begins at conception.Romney declined to attend the event held in Greenville.