From CNN via Google Future:
This is according to a new DLC system that breaks down pledged delegates into the categories of genuine and fraudulent delegates. Genuine delegates are those elected in a closed democratic primary or an open democratic primary with fewer than 20% African Americans. Fraudulent delegates are won in open primaries, heavily African American regions, and in caucuses.
(snip)
"Caucuses unfairly favor Barack Obama's supporters and open the process to intimidation and gaming the system," stated the Clinton press release.
You can read more
http://www.somethingawful.com/d/news/hillary-attack-obama.php?page=2">here.