People aren't voting "against human rights", they are voting not to change the definition of marriage. Human rights aren't on the ballot, a word in the dictionary is.
That's how you see it. I see it as a attack against the human rights of gays and lesbians by old homophobes and religious zealots. If marriage truly is a religious institution, then the government should not be dictating who gets married and who doesn't. That is completely unconstitutional. On the other hands, civil unions for all people is perfectly constitutional.