Who is Edward Snowden?
Look at 7 minutes 40 sec in https://www.youtube.com/watch?v=XEVlyP4_11M
It would seem a healthy number of American don't know who Edward Snowden is, so they'd have to be lead in the interviewing. Without seeing the script it is hard to know if the survey has merit.
It could have been something like this:
"Do you think Edward Snowden should be pardoned?"
"Who is Edward Snowden?"
"He is this guy who admits that he spied on the NSA, then he went to Russia."
"Give him the chair."