Liberalism is a cognitive error to a large degree. Much of the leftist platform is based on an inability to contextualize information. Of course the conservative platform has it's own bag of cognitive errors too, but in the modern era the left side of the isle is more rife with them.
For example, most liberals concern themselves with unemployment and the wellbeing of the lower classes, but neglect to acknowledge that the easiest way to create 30 million jobs and dramatically raise wages for the lower classes would be to start deporting the 30 million illegals we have living in the USA.
However, let's not forget that the O-bomb was a direct response to 2 terms of Bush, and that the Republican party currently only has a handful which are any better than Bush...