The SnowdenGate revelations about the NSA would seem to be what is arguably just another huge example of what, in hindsight, appears to have been a continuing government-mandated onslaught on the American Constitution over many years. It has apparently all been happening in various guises, whilst the American people were wide-awake, and it's apparently been happening right under their noses.
The action/inaction of the Senate and now Obama regarding NSA surveillance would seem to demonstrate that the political leaders are evidently not going to do anything to rectify matters or reverse any damage already done to the Constitution and people's rights/freedoms, so one probably needs to accept this and get used to it.
Apparently nothing materially effective has been done or seems likely can/will be done about it by the people either, presumably variously due to (say) apathy, a lack of interest, a lack of spine or a lack of any real sense of individual empowerment.
The only individual effort recently seems to have been Snowden's, and sadly that would not seem to have achieved much other than to confirm that things were apparently already much worse than we might have otherwise supposed.
Therefore, it could be true to say that it was already "game over" even before Snowden's revelations, and those revelations merely announced the fact into our awareness.
If that is the case, then no amount of belated shouting, invective, screaming or throwing of tantrums at the enormous reinforced concrete walls of the Establishment is going to make a blind bit of difference. One does not really have a choice under such circumstances. One is probably in an anechoic chamber anyway.
My suggestion would be to focus one's cognitive surplus on what is important to oneself and that which one can effectively exert some beneficial and positive influence over - including, for example (say), one's family and loved ones, one's work, one's hobbies, one's friends.