Apparently, by allowing gays to marry we are encouraging poor black women to be single parents and this is leading directly to young black men failing to graduate high school. The fact that you can't compare the household of two parents of the same gender to a household involving one parent never occurs to the author.
While I have known many a single parent, the causes behind such a situation are very, very, very different from what leads to two men deciding they want to raise a child together. Single parenthood can be the result of losing your partner to death or divorce, or it can be an accident, or it can be someone wanting a child and not caring about having a partner. Single parenthood is a complex issue and one that is very separate from SSM. That's without even touching the influence of poverty, which I imagine has a lot more to do with the high school dropout problem than the mother's marital status.
Should children ideally be raised by one man and one woman? I don't think so; not because there is anything wrong with the nuclear family, but because families are such an incredibly diverse concept that there is no "ideal."
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And, you know what? Not even those points would have made any of this have anything to do with the gender of the two parents in the two parent families this article is so high on.