It used to be law that slaves couldn't marry. Heck, slaves used to be legal. Funny how laws work. Should they not be allowed to marry then. They plan on raising a child.
Current law says no.
Gays and lesbians want the right to marry for the same reasons other Americans do. Legal recognition that they are two people who love each other. The vow enshrines love, honor, respect and mutual support. Gays are brought up and socialized like other Americans are and view the idea of marriage as reverently, as spiritually, as purely as heterosexuals do. To mock them or deny them the right to marry is to mock the institution of marriage itself.