Obama campaign memo to superdelegates
www.dailykos.com/story/2008/05/07/510830/-Obama-campaign-memo-to-superdelegates
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
There are only six contests remaining in the Democratic primary calendar and only 217 pledged delegates left to be awarded. Only 7 percent of the pledged delegates remain on the table. There are 260 remaining undeclared superdelegates, for a total of 477 delegates left to be awarded.