What a bad article. Here's the original one: http://www.lifeslittlemysteries.com/2187-incompetent-people-...
The original article basically claims that people who are incompetent at something will have a hard time recognising people who are competent and their own level of incompetence. Fine, that makes sense. But how on earth did this get turned into "Americans too dumb for democracy"? This is just taking some of the claims from the original article and blowing them out of proportion.