Orphans: At Least They're Not Raised By Homos

Ann Friedman highlights something I'd missed from this article. Here's John McCain on gay adoption:

"I think that we’ve proven that both parents are important in the success of a family so, no, I don’t believe in gay adoption."

I think that's a great argument against allowing gays and lesbians to steal children from happy two-parent heterosexual families, but why on earth is the importance of both parents a good reason to prevent gay couples from adopting orphans?