Senator says he had PTSD when he wrote thesis

FILE - In this Feb. 11, 2014, file photo, Sen. John Walsh, D-Mont., right, and his son Michael leave the Old Senate Chamber on Capitol Hill in Washington, after a ceremonial swearing-in ceremony with Vice President Joe Biden. Walsh's thesis written for the U.S. Army War College contains unattributed passages that appear to be taken word-for-word from previously published papers. The Democrat is running to keep the seat he was appointed to in February. Walsh faces Republican U.S. Rep. Steve Daines on Nov. 4. (AP Photo/Lauren Victoria Burke, File)Sen. John Walsh of Montana said Wednesday his failure to attribute conclusions and verbatim passages lifted from other scholars' work in his thesis to earn a master's degree from the U.S. Army War College was an unintentional mistake caused in part by post-traumatic stress disorder.