A state judge in Lafayette on Monday declared Louisiana’s ban on same-sex marriage unconstitutional, a ruling that conflicts with a federal judge’s decision earlier this month upholding the state ban.Fifteenth Judicial District Judge Edward Rubin’s decision, made in an adoption case involving two women in Lafayette, will have no immediate impact on the status of same-sex marriages in Louisiana. Rubin’s strike at the ban is another salvo in a legal battle that soon could be settled by the U.S. Supreme Court. “This is a major win for Louisiana families, but it’s the first step in a long road,” said Chris...