What do we look for in a leader? Political vision? Sound policies? Compassion? Well, no. A deep voice appears to be the answer, says Casey Klofstad of Miami University. His research indicates that a mellifluous bass tone is the perfect credential for a true leader. The deeper the voice the better the politician, voters seem to think. And you thought it was Darth Vader’s ruthless cruelty that took him to the top.