That is, making an optimal choice for your vote is an extremely expensive undertaking. Thus, relatively few people do it well.
If I may, I'd like to squish the content of your comment into the single word "motivation." At present, it takes a high enough amount of motivation to either take time off work to vote early, vote by mail, or wait in excessively long lines after work, that far fewer than a majority of people participate. The arguments I've typically heard suggest that highly-motivated voters are more likely to make correct choices, and well-informed voters are more likely to be motivated.
My (untested) conjecture is that, rather than trying to increase motivation, we should decrease the level of motivation required by making it ridiculously easy to vote. Allowing larger numbers of less-motivated voters may lead to an improved "wisdom of the crowd" effect[0][1], counterbalancing the vocal minorities that we often see controlling local and national politics.
[0] http://arstechnica.com/science/news/2011/12/in-group-decisio...
In your second link, it notes two problems. First, it says that Crowds tend to work best when there is a correct answer to the question being posed, such as a question about geography or mathematics. I submit that this is quite the opposite of political questions.
But more importantly, it also discusses one of the big problems of "Wisdom of the crowd", although it couches it as an advantage. The effect is enhanced through communication between individuals, as would (and should) be the case in any political question. To this I reply with two words: "witch hunt".
History is replete with examples wherein the common, accepted ideas of society have stood in the way of progress -- I don't think I even need to recite any. And the whole point of the United States is to protect the minority, or even the one, against the will of a strong majority. So I don't think it's wise to strengthen further the crowd-based aspect of our political system.
But that said, it's important to distinguish "crowd" from "people". I've lately been trying to explain to people that the vote is the least important (while still being necessary) part of a democracy. The effort of explaining to the whole population why a certain law needs passage is the soul of democracy; votes are merely to maintain a formal record of dissent and to resolve deadlocks. They're decision making tools of last resort.
You didn't go to high school or the library growing up?