As Dick Cheney and John Edwards prepare to debate Tuesday in Cleveland, the American public generally and political independents in particular have a more positive view of Edwards than of Cheney, the University of Pennsylvania’s National Annenberg Election Survey shows. About as many registered voters had a favorable view of Cheney as had an unfavorable one. With the data’s margin of sampling error of plus or minus three percentage points, the 37 percent favorable, 42 percent unfavorable margin was not statistically significant. For Edwards, it was 38 percent favorable and 31 percent unfavorable. The polling of 1,515 registered voters was conducted from September 29 through Sunday, October 3.