Finally got around to reading this in Newsweek. Good quotes:
The second argument I often hear is that traditional marriage furthers the state’s interest in procreation—and that opening marriage to same-sex couples would dilute, diminish, and devalue this goal. But that is plainly not the case. Preventing lesbians and gays from marrying does not cause more heterosexuals to marry and conceive more children. Likewise, allowing gays and lesbians to marry someone of the same sex will not discourage heterosexuals from marrying a person of the opposite sex. How, then, would allowing same-sex marriages reduce the number of children that heterosexual couples conceive?
California’s Proposition 8 is particularly vulnerable to constitutional challenge, because that state has now enacted a crazy-quilt of marriage regulation that makes no sense to anyone. California recognizes marriage between men and women, including persons on death row, child abusers, and wife beaters. At the same time, California prohibits marriage by loving, caring, stable partners of the same sex, but tries to make up for it by giving them the alternative of “domestic partnerships” with virtually all of the rights of married persons except the official, state-approved status of marriage.