According to John Oliver most people think Edward Snowden is Julian Assange. Oliver did "man-on-the-street" style interviews in New York, asking people who Snowden was. Most people, if they knew the name at all, thought he was "the guy who sold government secrets to Wikileaks."
The report doesn't mention this at all, so I'm not sure what to make of the statistics. If you asked people "Which color is brighter: green or brown" but they had never heard of brown before, you wouldn't be able to draw many meaningful conclusions from it. The report itself doesn't even mention what questions they asked people. There's really just no information here at all.