Miss. man accused of sending letters with ricin Associated Press Copyright 2013 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Updated 6:20 pm, Wednesday, April 17, 2013 (AP) — A Mississippi man was arrested Wednesday, accused of sending letters to President Barack Obama and a senator that tested positive for the poisonous ricin and set the nation's capital on edge a day after the Boston Marathon bombings. A package at Sen.