Primary every candidate every election.

http://www.realclearpolitics.com/articles/2013/10/29/throw_the_rascals_out_120481.html

"In other words, we need to think about what there is about current political practices that repeatedly bring to power such a counterproductive set of people. Those we call "public servants" have in fact become public masters. And they act like it."

If a average selection were put in power every time, we could be assured that there would be less corruption than now. No one person could assure an action so bribery would be more difficult. No longer seek unfair advantage for your state to "bring home the bacon"