http://www.huffingtonpost.com/seth-abramson/clinton-in-2008-opposed-e_b_10245288.html
In 2008, in a move that surprised Democratic superdelegates as well as many in the media, Hillary Clinton issued a stern warning via letter to both the media and elected Democratic officials clarifying that “at this point, we do not yet have a nominee.”
Even more surprising, Clinton’s letter to the most powerful members of her party and the entirety of American media noted that even “when the last votes are cast in early June,” neither she nor her primary opponent would “have secured the nomination. It will be up to automatic delegates...to help choose our party’s nominee.”