I'm referring to the lack of class-based voting in the US mostly. You can't quite tell a persons' partisan leanings in the US just by background or income.
Of course it's mostly referring to his claim the Democrats are the party of "rich gentry, trial lawyers and blacks" and the Republicans of everyone else, which is quite far from the truth. The only one of those which my 89% for Obama neighborhood has a significant number of is blacks and even then it's only about 25%, so there are clearly other people voting for the Democrats.
You left out the horde of government employees from your Dem checklist. You know what's quite amusing? The number of people in the scene who are also government employees. I know tons who work for the city of Minneapolis or Hennepin County or the state. I wonder what the reaction would be of the anarchist punks of the 80s if you went back in time and told them that 20-30 years later their spiritual descendants would all be working for or at least supportive of the government while the conservative opposition would be the ones opposed.