Oh, and I bet that the vast majority of LGBT republicans are white gay men. I wouldn't be surprised if Obama only got 60% or so with them.
I would imagine that within the LGBT community, there is variation based on other characteristics like race, education, gender and income. If you had a group of lesbian black women who make less than $25K a year and a group of gay white men who work for Goldman Sachs and make $100K+ a year, even if Obama carried both groups, it stands to reason that he would do better among the first group than among the second group.
Or live in Orange County or wherever and make/have made a good living as lawyers, businessmen, etc.