Mitt Romney softened his stance on one of President Obama's immigration directives allowing certain undocumented immigrant youth to stay in the U.S. legally. In an interview with The Denver Post Monday, Romney said he would not reverse an executive order issued by President Obama that would allow children of illegal immigrants to obtain a visa, permitting them to live and work in the U.S. legally for two years, if they meet certain criteria. "The people who have received the special visa that the president…