Bottom line, how do people vote against human rights? It's just incomprehensible to me.
Because they do not see it as a right.
Getting allowed to marry the one you love isn't a right? Of course the real answer is that those people feel homosexuals made a "choice" and shouldn't be allowed to dirty the "institution of marriage" on their whims and fancies.
I think it's quite obvious that the people who vote against it don't think it to be a right, yes. That's not my personal opinion -
certainly next-of-kin status is a right - but a recognition of reality. You can't win these people over, or at least win them over into not caring, by using the language of rights. Which is a bit of a problem in a country where political discourse is so utterly dominated by liberalism as the U.S - because it means that the language of rights is practically the language of politics.