As a citizen, the most influence you have on laws is taking the time to speak with your congressional representative. The more effort you spend, the more your representative will listen. Sure, you won't actually get to talk them in person, but you will be able to talk to their staffers, which in some cases is even better.
Today, there is a widespread campaign by leftist groups asking you to inundate your representatives with robotic calls and emails. They use code to make this really easy for you. Sadly, your representatives will see it as easy, that you didn't care enough to take the effort yourself.
Instead of following the crowd, I suggest you spend the effort. Look up your representative's information (or senator) and call them or write them a handwritten (to show effort on your part) letter. Instead of repeating the phrases fed to you by activists, say in your own words what troubles you. This is especially true since the activists are feeding you misleading information (no, the NSA cannot monitor 75% of Internet traffic).
That's what I'm going to do today, speak in person with my representatives, partly to influence them to stop NSA surveillance of citizens, but mostly so that I jam the line preventing the robotic callers from getting in.
By the way, the issue that is important to me is the same sort of issue that provoked the Boston Tea Party of 1773. Britain had repealed the onerous taxes, all except the insignificant tax on tea. The reason the colonists rebelled was not because of the amount of money, which was tiny, but because "taxation without representation" was an intolerable philosophical idea. It meant that the colonists were "subjects" to be exploited by Britain, and not "free citizens" of the realm.
The same thing is true here with the Section 215 collection of phone records. In truth, the impact on citizens is insignificant and there are extensive safeguards to prevent this from being abused. None of that matters to me, as it's still surveillance of innocent citizens suspecedt of no crime. It subjugates us, and is an intolerable infringement on a free person's rights.
Anyway, those are my words. Call your representative and give them your words.