Filmmakers Carl Deal and Tia Lessin are partners in life, as well as behind the camera. Their first joint directorial feature, 2008's "Trouble the Water" about New Orleans after Hurricane Katrina, earned the duo an Oscar nomination. For their latest effort, "Citizen Koch," Deal and Lessin moved from a touchy political topic to touchy politics overall, namely the increasing role of money in elections. And at the center of the new doc is Wisconsin.