LAST WEEK, the long-awaited Massachusetts Goodridge gay-marriage decision came down--hard. In a 4-3 ruling, the Massachusetts high court held that the millennia-old, cross-cultural definition of marriage as the union of a man and a woman is utterly irrational. Using the lowest level of scrutiny (the "rational basis" test, which almost always results in deference to the legislature), four well-educated judges could not think up any reason other than "animus" why the people of Massachusetts and their elected representatives might not want same-sex marriage. Only a fool or a madman (or a bigot), they implied, could possibly disagree. The judges gave...