DETROIT (AP) — The top legislative body of the Presbyterian Church (U.S.A.) has voted by large margins to recognize same-sex marriage as Christian in the church constitution, adding language that marriage can be the union of "two people," not just "a man and a woman."The amendment approved by the Presbyterian General Assembly on Thursday requires approval from a majority of the 172 regional presbyteries, which will vote on the change over the next year. But in a separate policy change that took effect last week, delegates voted to allow ministers to preside at gay weddings in states where the unions are legal and local congregational leaders approve. Nineteen states and the District of Columbia recognize same-sex marriage.The votes, during a national meeting in Detroit, were a sweeping victory for Presbyterian gay-rights advocates.