Texas Gov. Rick Perry, pictured last month in Orlando, Fla., has said the Texas National Guard must follow state law despite a Department of Defense policy directive on same-sex marriage benefits. Phelan M. Ebenhack/AP hide caption

itoggle caption Phelan M. Ebenhack/AP

Plaintiff Edith Windsor of New York waves to supporters in front of the Supreme Court in Washington after the court heard arguments on her Defense of Marriage Act case. Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP

Gay rights activist Vin Testa of DC waves a flag outside the U.S. Supreme Court building on Tuesday in Washington, DC. Win McNamee/Getty Images hide caption

itoggle caption Win McNamee/Getty Images

April DeBoer (second from left) sits with her adopted daughter Ryanne (left) and partner, Jayne Rowse (fourth from left), and her adopted sons Jacob (middle) and Nolan (right) at their home in Hazel Park, Mich. The lesbian couple's desire to adopt each other's children has grown into a potentially ground-breaking challenge to Michigan's ban on same-sex marriage. Paul Sancya/AP hide caption

itoggle caption Paul Sancya/AP

Former President Bill Clinton (and then-Vice President Al Gore) in 1996, the year Clinton signed the Defense of Marriage Act. Stephen Jaffe /Reuters /Landov hide caption

itoggle caption Stephen Jaffe /Reuters /Landov

Edith Windsor, whose case led to an appeals court striking down the Defense of Marriage Act. Shannon Stapleton /Reuters /Landov hide caption

itoggle caption Shannon Stapleton /Reuters /Landov