LAS VEGAS -- An unemployed graphic designer who told investigators that he found making ricin an "exotic idea" pleaded guilty Monday to possessing the deadly toxin in a hotel room here. Roger Bergendorff, 57, also pleaded guilty to a federal weapons charge. (A second weapons charge was dropped.) He could face up to 20 years in prison at his Nov. 3 sentencing, though prosecutors are recommending that he serve a little more than three years. Bergendorff reportedly fantasized about harming people with the poison -- he had sketched an "injection delivery device" disguised as a pen -- but never carried...