Up until a few yrs ago, polygamy was legal.
Up until a few yrs ago, biracial marriages were illegal. What is your point?
It certainly is about equality and your responses to my point about EVERYONE else being allowed to marry EXCEPT gays kind of highlights it further.
Marriages change based on society. Those examples prove it. And it's not about 'sanctity,' as my list of everyone else allowed to marry proves that.