http://www.people-press.org/2013/06/10/majority-views-nsa-phone-tracking-as-acceptable-anti-terror-tactic/ Better article on the study. The polls were taken earlier this month (Jun 6-9). So, the study was started right before the major leaks came out.

No mention of when this most recently was conducted. I imagine most peoples' attitude was "Well, I know they aren't tracking me, I do nothing wrong (or bad enough)." I have a feeling that more people are starting to wake up to the fact that it doesn't matter if they did anything or not, they are under 24 hour surveillance.