"And how much support do they attract" I already addressed this question. As I said, fringe elements of today may not be mainstream tomorrow. It of course depends on our actions. My belief is that legalizing gay marriage may serve to embolden these fringe elements. Only a few decades ago, nobody could have even thought that we would even be talking about gay marriage sometime in the future. And today gay marriage is becoming a reality in many places. Interracial marriage is a totally different issue. We're talking about what may be perceived by many(including yours truly) as abnormal sexual orientation of individuals. Interracial marriage is about race, not sexual orientation. It's a different issue.