<p>Photo Essays:•Battle Over Gay MarriageSTORIES BACKGROUND •Mass. AG: Gay Marriage for Residents Only•Marriage Debate Builds Steam in Senate•Bush Wants Amendment to Ban Gay Marriage•Senate to Debate Banning Gay Marriage•Gay Activists Rally Against Virginia Law•Mayors to Vote on Gay Marriage Resolution•Romney Urges Amendment Against Gay Marriage BOSTON — A 1913 Massachusetts law that is being used to prevent out-of-state gays from getting married here is discriminatory and should be struck down, a lawyer for eight same-sex couples (search) told a judge Tuesday.</p>