Massive surveillance has nearly full bipartisan support. You can't just "vote them out". You have to somehow convince everyone to vote third party, which they all think is a wasted vote.
It's not that hard, you just have to convince half the voters the 4th amendment is more important then being afraid of terrorists. No politician wants to support this they just think they have to to appear 'tough' on terrorism for their constituents.
Voter turnout for primaries is usually really, really low. You don't need to convince half of those who do vote; if you just convince 1/4 of those who could vote but don't, you can dominate the primaries.
Not that this is easy, but it's another option.
so it's not hard, except for that whole "getting the apathetic to vote" part? America is called a sleeping giant for a reason.
What about voting "them" - that is, supporters in both parties - out in the primaries?