** FILE ** Then-U.S. Chief District Judge Vaughn R. Walker of the Northern District of California speaks at a legal conference in Seattle in November 2010. (AP Photo/Elaine Thompson)

Photo by: Elaine Thompson

** FILE ** Then-U.S. Chief District Judge Vaughn R. Walker of the Northern District of California speaks at a legal conference in Seattle in November 2010. (AP Photo/Elaine Thompson)