That's completely ass-backwards. You do realize that most people aren't spending their free-time on a political message-board, crossing-swords (Snnrrk) with Republicans, right? No, most people tune out politics, and are focused on working, family, and the minutiae of life. The people's representation has utterly failed them, and understandably, much of the public has been jaded for at least far back as I remember.
Within my 'circle', those friends and family that I know well, I'm easily one of the most, if not the most invested in politics, only challenged in that regard by my twin brother. This has caused no shortage of friction, and has probably damaged some of my personal relationships. Add in the massive information-overload that we've been afflicted with, and it's no wonder why regular, sane folks simply check out.
It is the candidate's burden to excite these people, to give them a reason to believe that they are fighting for them. It's the politician's job to cut through the bull**** and give the average Joe a reason to believe that going to vote is important, and will substantively improve their lives. Until a party steps up to the plate and boldly offers real change without beating around the bush, then voter-turnout will always be weak.