Interesting article. While I don't think I agree with James Dobson on much, I think he was exactly correct when he states in this article:
That's really all that needs to be said on the subject of gay parenting. It's irrefutable. Biology does matter. We're a species that has male and female members, and those members are not interchangeable or irrelevant. Both are equally important and necessary for reproduction. And because of that fact, both genders are important for providing role-models of a viable reproductive social organization for children.
Edit:
Furthermore, the objections to this concept seem to primarily revolve around homosexuals demanding equal treatment for themselves. Asserting their equal right to heterosexuals to be parents. The implication being that to deny homosexuals an equal right to be parents, is somehow a slight or insult towards the homosexual individual. To oppose the concept of gay parenting is thus cast as blatant anti-homosexual bigotry.
But that completely misses the point. This is not about the rights of adults to be parents, it's about the right of children to have parents. Every human being starts existence out of a genetic union of a man and woman. This societal move towards denying that reality, and turning parenthood into some fundamental right of every adult regardless of their suitability or ability to be a parent, is like trying to legislate fantasy.
It reminds me of this scene:
http://www.youtube.com/watch?v=sFBOQzSk14c