A lot of gay people don't think gay related issues are the most important ones with which America needs to deal right now.
They're still voting against their own (and other people's, let's not forget) rights for utilitarian reasons, which in my view is both morally and mentally questionable.
No, they are sorting out which of the short comings of A versus B are less negative to the public square vis a vis others.
If for example, you think Obama's policies will lead to an economic US collapse akin to Greece over time, then perhaps whatever remains of the gay rights issue that will be put on hold as part of a change of course is of lesser importance.