Think of radio and TV campaign ads as the soundtrack of an election season-deep and ominous voices sound the attack, sugary and optimistic voices signal support. As part of our series on the “dark arts” of the campaign business, we meet the people behind the voices trained to influence the democratic process. As WBEZ’s Alex Keefe found, some of the most famous political ads in recent American history may have been voiced in a closet near you. Photo: Flickr/The Word Factory Ltd