...a state to restrict marriage to one man and one woman.
See here. In case you're wondering why you should read it, it's called "Open Monogamy" and is about how some social scientists think it's just ducky that homosexual "marriage" will lead to a redefinition of "monogamy" to mean...um...I'm not sure. I think it means that you can have sex with anybody you want to and still call yourself "monogamous" as long as you are emotionally unattached to all the sexual partners other than the partner with whom you are said to be in a "committed relationship."
I'm waiting for the apologies from all the people who said, "How could this possibly hurt straight marriages?" in 3...2...1. Oh. Guess I shouldn't bother waiting.