It was a dream, and in dreams you have no choices: either there are no decisions to be made, or they were made for you long before ever the dream began.
Marriage is almost as old as dirt, and it was defined in the garden between Adam and Eve. One man, one woman for life till death do you part. So I would never attempt to try to redefine marriage. And I don't think anyone else should either. So do I support the idea of gay marriage? No, I don't.