Straight couples don't have to be monogamous to be married or married to be monogamous. Monogamy no more defines marriage than the presence of children does. Monogamy isn't compulsory and its absence doesn't invalidate a marriage.
Like it or not children are being raised by gay and lesbian parents all over America - as many as 10 million children. And it does nothing to make their lives more stable and secure to attack their families, to attack their parents to prevent us from marrying each other.
Yes, yes: Taking out Saddam Hussein means war, and war is bad for children and other living things. I went to grade school in the 1970s, and I recall the poster. But there are times when war is not only a tragic and unavoidable necessity, but also good for children and other living things.
Children have a right to some stability and constancy from the adults in their lives.
I believe it's in the best interests of a child to be in a stable environment.