I've been saying this for a long time, but pre-Snowden I was always met with heavy deference of trust for the checks and balances system. I claim that there has been a backroom debate in the higher level Military Industrial Intelligence Complex (Top tier NSA, CIA, DoD, Pentagon, NSC) in which it was concluded that technology has created a potential for a single non-state entity to cause massive damage, and that "Total Information Awareness" is the only way to prevent it.
Of course, I disagree that the purpose of TIA is security, and I also disagree that it is even successful, but the real issue at hand is beyond that, and is about how the debate was had and who was involved. There was no public debate, and any that did leak was tightly brought under control (with NSL's etc). This is an affront to the democratic process imho, but even if one were to argue that our representatives were involved, I would say there has been a stratification of the congresspeople, so that only a select few people on a select few committees even get to participate, and even then the ones who do are unable to grasp the subject matter fully. Of course no staffers get to see it either.
With the knowledge of how intel agencies work, and more specifically, the contact sport of politics in the beltway, I would also venture to say that even if a fairly principled rep did make it on a relevant committee, though would quickly be brought back under control via the standard methods.
I won't get off too far into this rabbit hole, lest I am accused of conspiracy theory, but I truly think the system of checks and balances is not only crumbling, it is in ruins. Even worse, a facade is being put up to cover it up.