I know relatively little about Coates. But, I did a search on him and read that he did a conference in 2008 with Former FEC Chairman, Scott Thomas.
Coates spoke on: Race and the Voting Rights Act: U.S. v. Brown
Christopher Coates, Voting Rights Section, U.S. Department of Justice
http://www.virginia.edu/uvatoday/newsRelease.php?id=4231
Does anyone here know about Coates prior to this case?