Lydia Nichols recently pointed me to an article in Mother Jones that had some mildly interesting flaws whose cognitive origins can be largely traced.
The main point of the article was to talk about gerrymandering, and the clear damage that highly successful gerrymandering–together with increased segregation along political lines–has done to our representational democracy. And the article was, as far as I could tell, basically factually correct. However, the implications drawn had two neat errors.