Wyatt Tan (left) and Mark Nomadiou, both of New York City, kiss in front of the Supreme Court in Washington on Wednesday, March 27, 2013, before the start of a court hearing on the 1996 Defense of Marriage Act (DOMA). In the second of back-to-back gay-marriage cases, the high court is turning to a constitutional challenge to the law that prevents legally married gay Americans from collecting federal benefits generally available to straight married couples. (AP Photo/Carolyn Kaster)

Photo by: Carolyn Kaster

Wyatt Tan (left) and Mark Nomadiou, both of New York City, kiss in front of the Supreme Court in Washington on Wednesday, March 27, 2013, before the start of a court hearing on the 1996 Defense of Marriage Act (DOMA). In the second of back-to-back gay-marriage cases, the high court is turning to a constitutional challenge to the law that prevents legally married gay Americans from collecting federal benefits generally available to straight married couples. (AP Photo/Carolyn Kaster)