"Over one third of self-identified gay voters pulled the lever for Republicans on Tuesday, a 4 percentage point increase from the same demographic in 2008."
And 2008 was already a far better year for the GOP in this regard (compared to the immediately preceding cycles).
That's what tends to make me think that the growth in gay support for GOP candidates in this cycle was not solely a function of reacting to Obama or the economy. It seems to be a trend over a longer period of time.
The comparatively limited GOP focus on social issues in this mid-term election probably didn't hurt either.