Why is New York City telling married couples they can marry again?

As the date of the first same-sex weddings in New York approaches, consider this. On the website for the Clerk's Office for New York City, there are questions and answers for same-sex couples. Scroll down and find the following: "Can my spouse and I get married in New York City if we already were married in another state or country?" The answer: Yes. The page goes on to say that New York