I have received numerous calls from people who were married in DC and are in a same-sex marriage, but, neither party currently lives in DC.
Usually, in order to file for divorce in DC one of the parties must have been a resident of DC for at least six months prior to filing for divorce.
The law has been changed for same sex couples:
Now, same sex couples can file for divorce in DC if they were married in DC and both parties now live in a State that does not permit same sex divorce.