It's not surprising. The Zimmerman trial was an excellent distraction to get everyone's mind off of privacy and on to racial divisiveness. Now that the trial's long over, all that NSA stuff seems so distant in the memory of the average American. It was a brilliant move by the administration.
It's highly unlikely that anything about the Zimmerman trial was a deliberate ploy to distract the American public from more pressing issues but... The president did explicitly weigh in on the trial which gave it more notoriety in the press. It's not impossible that he was hoping it would distract from the NSA issue.
More likely though, there are just more people for whom race relations is a bigger deal than government spying.
