That disinterest is part of what drives the issue of poor electoral choices. The most radical candidates can draw the most support in primaries since the voter turnout is so low.

I also feel the disenfranchisement that you talk about. I think non-electoral civic engagement is also an important part. I try to write my representatives on some issues. It seems largely futile, but often times you get a more detailed response from them than you see I'm the media. I also try to right the wrongs I encounter in my community. For example, a police department was wrongly stating that a specific summary offense was a misdemeanor and I was able to correct that. I also encountered a state trooper that was doing things that violate civil rights, like lying to a judge. I filed a complaint and he was counseled (should have been fired but the investigator covered for him - only so far up the chain you can chase corruption before your life/safety becomes a concern).