Well, under our two party system you end up with two shopping carts full of positions, and you've got to buy one of them. Now neither shopping cart typically lines up perfectly with a hypothetical voter, but what do you do if both baskets contain things that you feel deeply about and oppose?

For instance where should a voter who cares deeply about abortion and capital punishment to go? The Democrats are not simply pro-choice, they demean and belittle his pro-life position. The Republicans find it inconceivable that he doesn't want to execute people guilty of the most heinous crimes, and he's dismissed as an unserious bleeding-heart. So maybe it's not that he's unexcited by the issues, but rather because of his strong inclinations he has no one to vote for.

It might be that low turnout is evidence that the current 'baskets' of the two parties are poorly aligned with the current electorate.