Mataconis records it. Romney went from saying this:

"I know many gay couples that are able to adopt children. That’s fine,"

to saying this:

"I simply acknowledge the fact that gay adoption is legal in all states but one.”

The Etch-A-Sketch shake took only 24 hours. And Romney had to say something untrue to get there:

It is true that most states permit single-parent adoption when the parent is homosexual, but the majority of those states also bar joint adoption by a gay couple (with some states having an exception if the child in question is the natural child of one of the partners). Since it was adoptions by gay couples that Romney was originally referring to on Thursday, his comment on Friday essentially involved moving the goal posts, in addition to wimping out on standing up for something for once.

David Link's view:

Obama hip-checked Romney into the absolutists, and as the adoption episode shows, Romney is going to have a hell of a time getting back on his feet.  Whatever political instincts he has toward fairness cannot survive the melodramatic abstractions of the religious fervor he has to manage among his base.