1. The term "fundamental right" is a vernacular redundancy; all rights are fundamental. Whichever legal genius coined that term deserves a proper slap.Marriage has been recognized as a fundamental right.
Regardless, Constitutional Equal Protection applies to privileges granted by states as well as those that are considered "fundamental rights"
2. A state-sanctioned marriage is not a right, "fundamental" or otherwise. A positive obligation from an unwilling party is not a right, it's coercion. As I said to Jerry, I am under no obligation to recognize or validate your lifestyle choices nor am I obligated to confer benefits upon you because of those lifestyle choies.
You, like many other Americans, have a distorted view of rights. Jefferson said:
"Of liberty I would say that, in the whole plenitude of its extent, it is unobstructed action according to our will. But rightful liberty is unobstructed action according to our will within limits drawn around us by the equal rights of others. I do not add 'within the limits of the law,' because law is often but the tyrant's will, and always so when it violates the right of an individual." --Thomas Jefferson to Isaac H. Tiffany, 1819 .
Rights are not entitlements, they are negative obligations which require the inaction (not the action) of second parties. A state-sanctioned marriage obliges my recognition and defference, hence it is not a right. Also, I'm waiting for you to adress my previous post.
 - Jefferson on Politics & Government: Inalienable Rights