For one, privacy concerns are just one very small part of what people may be looking for in an elected official. So small that most don't even have an official stance on the matter, aside from canned politician spin like "I value the privacy of all citizens" that actually means nothing. On average, I'd say that most people would still rate economic and diplomatic policies much higher.
Like just about everything else, this boils down to an education problem. Not just for the voters, mind you- it's even more important to educate our elected officials and judges. This way, they'll be able to make rational, informed decisions when the NSA comes asking for more money / power. (This is of course assuming the NSA doesn't have huge caches of blackmail evidence on the officials making the decisions...)
It doesn't even do that.