I'm from Massachusetts, the first of the US states to legalize same-sex marriage. There have been many gay and lesbian marriages in my state since then, and despite all the dire predictions, it hasn't done me or anyone else a bit of harm, nor has it threatened my (heterosexual) marriage in any way.

Someone else quoted Jon Stewart; I always liked another of his quotes on this issue: "I was against gay marriage, until I learned that it wouldn't be compulsory."

Why anyone wants to restrict anyone else's right to enter into a marriage involving two consenting adults is beyond me.