The smug style in American liberalism
Kyle Smith helps with some analysis.
Liberals embrace the smug life
Read Smith first, then if you need, go read the Vox piece. Smug is nearly always a result of living in an echo chamber, without countering opinion. This is a disaster for liberal, and is probably the reason they are unable to simply run the board on most elections. Obama's smug campaign in 2008 was backed up with indifference, dithering, incompetence, and failure. He reprised his smug campaign and was reelected in 2012. Stein's Law states, “If something cannot go on forever, it will stop.” This will stop once the electorate comes to the understanding that no matter how good the liberal positions sound, the implementation is bollocks.
Read the Smith piece, it is worth your time.