Surprisingly good from Vox.
The smug style in American liberalism
http://www.vox.com/2016/4/21/11451378/smug-american-liberalism "Finding comfort in the notion that their former allies were disdainful, hapless rubes, smug liberals created a culture animated by that contempt. The rubes noticed and replied in kind. The result is a self-fulfilling prophecy.
Financial incentive compounded this tendency - there is money, after all, in reassuring the bitter. Over 20 years, an industry arose to cater to the smug style. It began in humor, and culminated for a time in The Daily Show, a program that more than any other thing advanced the idea that liberal orthodoxy was a kind of educated savvy and that its opponents were, before anything else, stupid. The smug liberal found relief in ridiculing them."