I would like to offer some advice that could calm the troubled waters of the marriage debate for a good while for the LDS Church and its government: Find a better group to discriminate against!
Seriously, just think this one over. As things stand right now, if you're a Nazi, neo-Nazi, skinhead, KKK member, murderer, rapist, thief, pedophile, lawyer or politician, there is nothing getting in your way of marrying and, even worse, starting a family. You can even be incarcerated and, with a lot of persistence, manage to pull off a prison wedding.
If the biggest reason for getting married is to procreate, then we should never want these types of people to do just that and, let's face it, I find nothing about the above-mentioned folks that is natural or normal in their behavior.