My contempt-o-meter just went off the scale and broke the needle.
If Herself, the Cold and Joyless, were taking such a position for principled reasons, that would be one thing. Consistent, but misdirected. But Herself is doing this for the most cynical of reasons, simply to pander to a constituency.
Herself is floundering all over the board, and as a sign of that, has called in the "Shan" (previously known as the "Former Ocupant of the Oval Office, 1993-2001") to shore up her campaign awfully early in the game. The "Shan" already had no resistance to the idea of homosexual couples being given the unqualified right to adopt, but it was not one of his major core principles. With Herself, the acceptance of some political position or another is all in how it could be tied to a) perpetuation of power, and b) using that power to reinterpret the existing laws and statutes in such way as to alter or even reverse the standards and culture that are keyed to individual merit and intellectual honesty.
Extending marriage-like status to homosexual couples, and worse, giving them weight and authority far beyond their numbers, is purely a shameless bid for attracting their support without ever giving them very much in return. It is a feel-good gesture that has no basis in human realities.
Like sending females off to war, by placing no limitations as to where and when they may be deployed. When the realities set in, then, of course, all the horrors of warfare are amplified. You let the girl get hit, and that is just not nice.
Likewise, when children are raised in an exclusively single-sex household, they develop attitudes and behavior patterns that are a little extreme for most of the rest of society. Dysfunction leads to still more dysfunction.