 :Sorry, but I still haven't seen any convincing evidence to that effect.  It doesn't matter, though, since I generally only edit for clarity, not to enforce prescriptive grammar.  As far as copy editing goes, I don't care which form is used, as long as it makes sense in context, because it's not up to me to say which is better.  I do, however, try to change disputed words and phrasing to avoid edit wars (which obviously worked at Ohio.)   