It actually IS freely available to everybody, with ONLY such restrictions as have been deemed in the state's best interest.<quoted text>
You must be related to Babs. You spout the same brand of nonsense.
Marriage is a contract. There are rules and regulations about who can enter into it, and who cannot.
If marriage were a right it would have to be freely available to everybody. It's already limited in a variety of ways. Sex is just one of them.
Since there is NO state interest in banning gay couples from legally marrying, and great state interest in allowing it, your argument falls a bit flat.
To prevent same sex couples from marrying, you would need to prove that it's bad for them, bad for their children, bad for elderly gay people, and good for beneficial for society in a tangible way.
No one has yet been able to do that, and a lot of time and money has been spent trying. Can you do it?