While the two parties bring each other down in pursuit of a power monopoly, they both never the less manage to slowly but surely drag the whole country in certain general directions, most importantly a very corporate friendly direction. The moneyed interests of this country like things this way. They like using the mechanics of the electoral process and the offices themselves to leverage lawmakers into passing friendly laws, while on the other hand letting every other ideological point turn into as much of a stalemate as possible so nothing else gets done. At this point, nearly every lawmaker in the USA can be considered one of two things, a mercenary, or a patsy. Any other sort of lawmaker is too rare to be of significance.
The media, for its part, is just a handful of companies looking for a profit. They like whatever gets them a profit. These eternal, unproductive struggles between parties crank out good stories for them, so the media is happy with this.
So on theory there is the voter, but what does the voter do? The American voter lives in a system designed to facilitate their ignorance and apathy. There is no power in this country that is comfortable with informed and concerned citizens. The media spews garbage. The education system is left in disarray. The dealings of the government, the corporations, and what they do together, are all shrouded in secrecy. You can blame the people, but there's a bigger picture as to why the people are this way. It's not exactly an accident.
For these problems to be resolved, the USA would require both radical reforms to the electoral process and public service, as well as radical reforms to policies on information itself. Otherwise, voters will be not be informed enough and the vote will not count for enough anyway.