Show me any document saying "marriage" is a right and not a term defined as a union between a man and a woman by the society through out human history. And please don't give me that new definition BS, that's what I have been saying you don't just go around calling black people white, after all "African American" and "caucasian" are just term and definition right?
http://en.wikipedia.org/wiki/Loving_v._Virginia
From the decision:
Marriage is one of the "basic civil rights of man," fundamental to our very existence and survival