The major story in this year's midterm election campaign has been the sheer volume of cash that special-interest groups are pumping into House and Senate races across the country, much of it from anonymous donors. Robin Kolodny, a Temple political scientist, said a recent controlled experiment suggested that voters might trust an ad more that comes from a group with a "feel-good name," but at this point it might be too late: "Political science tells us that by now most of the voters have made up their minds."