President Obama said Wednesday that same-sex marriage “should be legal,” one day after North Carolina voted in an amendment to the state's constitution banning any union between anyone except one man and one woman. In an interview with ABC News's Robin Roberts, Obama said his position on it had evolved: “Over the course of several years as I have talked to friends and family who are in incredibly committed and monogamous relationships, same-sex relationships, who are raising kids together ... at a certain point, I've just concluded that for me, personally, it is important to go ahead and affirm that I think same-sex couples should be able to get married.” ABC News's full interview will air Thursday morning on Good Morning America.