It passed with 52% 6 years ago with an allegedly confusing ballot paper. You can't extrapolate from that to what might happen if you repeated the vote today.
I'm not saying it would easily pass again if a vote were held today. All I'm saying this establishes is that opposition to gay marriage is not, in the community at large, a fringe view.
Yes, a majority of Americans apparently now support gay marriage! Yay! But 43% remain against it. Of course, reasonable people could disagree about exactly what constitutes a "fringe view." But I doubt many would say that the term covers views held by 43% of the population.
So, yeah, maybe the ballot was confusing, and maybe that was six whole years ago. But I'd say it is, nonetheless, a generally pretty accurate indicator of people's views on the subject.