MONTGOMERY, Ala. — As Alabama's all-white Legislature tried to preserve racial segregation and worried about the possibility of mixed-race marriages in 1961, lawmakers rewrote state law to make it optional for counties to issue marriage licenses. Now, some judges who oppose same-sex marriage are using the long-forgotten amendment to get out of the marriage business altogether rather than risk issuing even one wedding license to gays or lesbians. In at least nine of Alabama's 67 counties, judges have quit issuing any marriage licenses since the U.S. Supreme Court legalized same-sex unions in June.