Hoping to demonstrate again that one franchise's draft bust might become an Oakland bonanza, the Raiders on Tuesday signed free agent defensive tackle Donnell Washington, a two-year veteran released by the Packers on June 9. Washington, 25, was Green Bay's third-round choice in the 2004 draft, but he never played a single snap in a Packers uniform in two seasons with the team. Two different staffs grew frustrated at his chronic weight problems and apparent lack of motivation, and first-year coach Mike McCarthy finally decided to cut ties with the former Clemson star after a minicamp earlier this month.