In an interview with ABC News' Robin Roberts, the president described his thought process as an "evolution" that led him to this decision, based on conversations with his staff members, openly gay and lesbian service members, and his wife and daughters.

"I have to tell you that over the course of several years as I have talked to friends and family and neighbors, when I think about members of my own staff who are in incredibly committed monogamous relationships, same-sex relationships, who are raising kids together; when I think about those soldiers or airmen or marines or sailors who are out there fighting on my behalf and yet feel constrained, even now that 'don't ask, don't tell' is gone, because they are ...