Several reasons:
- Elected officials have a direct vote. "These programs are subject to congressional oversight and congressional re-authorization and congressional debate." — President Obama on June 7. - If the campaign is successful, journalists will hear about it in a way that makes it more interesting to report on. If I'm a journalist, I want to write about a grass-roots campaign to change Washington--not a campaign to--what, change journalism? - I'm upset with elected officials such as my own Dianne Feinstein who are publicly defending the program. I have no beef with journalists. - It didn't even occur to me to send the book to journalists.
P.S. You are correct about the goal, but there is a further goal you did not mention: to change the law. The best way to do this: change the minds of lawmakers.
Of course, you can create your own publicity to some degree, and I do agree that elected officials are the ones who need to fix this, which makes them a good target in many ways.