The movie's big success in 2012 has not only re-ignited the old fight over class, but it has also won over a new generation of self-identified Democrats. A quick study of old material can be found in my book in which I call for rethinking not just how we think about political change, but also what we do with that change.

In his first big fight in 2011, President Obama was no fluke. In many ways he reigned on the left in an increasingly Democratic