Buzz·Posted on Mar 21, 2013Barack Obama Retweeted A Yoko Ono Photo About Gun ViolenceJohn Lennon's wife tweeted this picture yesterday in an effort to fight gun violence.by Samir MezrahiBuzzFeed StaffLinkFacebookPinterestTwitterMail He was wearing these glasses when he was murdered in New York City in 1980. A better look at the image she tweeted