As I have said many times, it is our job to create the politcal environment in which our elected officials find that our desires are "centrist." Often times, this takes only a phone call to the relevant elected official's office.
It is often said that if you don't vote you don't have the right to complain. I think this misses the point. I would rather have someone who does not vote but calls his elected representatives on issues that matter than someone who votes and then tunes out for the next four years. A citizen may have many reasons not to vote. But a true citizen, rather than a mere resident, is willing to invest time and effort into the running of the country and the well being of his or her fellows.
Heinlien often wrote books in which he preached the virtues of limited government (he was less insistent on this theme than others). But he always and consistently expressed contempt for the person who couldn't be troubled to take an interest in the well being of his country, and foretold dire consequences when citizens became too self-absorbed to care about civic responsibilities.