There were well-publicized protests in select California cities after President Obama was elected and Prop 8 was passed. Some of that anger was fueled by the rumor (false, see below) that the African Americans who voted for the candidate of African American descent also voted against same sex marriage.
This outrage was based not just on falsehoods but also on the fallacy that a civil rights victory for one group could come at the expense of another. Any recognition of rights in the face of discrimination means greater freedom for all. Any time we strike down a law or rebuke a tradition that discriminates against some Americans, all Americans benefit. The outcome of that election was not that we took one step forward and one step back but that we took one step forward.
DADT was a horrible law. Its imminent repeal means greater freedom for all Americans, religious and not, straight and not, for women and men, for the children of immigrants and for the descendants of Native Americans, etc.
(On Prop 8: In fact, it was members of the churchgoing population who voted in favor of depriving their fellow citizens the right of marriage; a result, no doubt, of the millions of dollars the Mormon Church poured into targeted get out the vote campaigns.)