When Barack Obama was elected in 2008, it seemed like his victory would kick off a new era of Democratic Party success. Then the party went on to lose the White House, Congress, most governorships and hundreds of state legislative seats. What went wrong? Thomas Frank says that it is all about economic class. He is the author of “What’s the Matter With Kansas” and “Listen Liberal.” In our interview, he argues the Democratic Party has been taken over by business elites who have steered the party away from its New Deal roots, and turned it into a party of Wall Street. He says that shift continued through the Obama years, and has driven working-class voters away from the party.