Supreme Court Justice Anthony Kennedy can’t seem to understand why every political community on earth until the year 2000 recognized marriage as the union of a man and a woman. In his mind, this can be explained only by anti-gay “animus.”

Justice Kennedy is wrong.

The state isn’t in the marriage business because it cares about love or romance, but because the sexual union of a man and a woman can produce new life and this new life deserves a mother and a father. When a newborn isn’t raised by the man and the woman — the mother and the father — who gave him or her life, social costs run high.

Today, let’s look at what marriage is and why it matters. Tomorrow we’ll consider how redefining marriage will undercut the public purpose and social function of marriage. On Thursday, we’ll preview where the marriage movement goes from here.

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