Do you have a source for this? Historically, republican voters are both poorer and less educated (which in and of itself has class implications). However, none of those demographics are relevant if they are all located in solid red states. Given that most people seem to attribute the swing state losses to the 'we need jobs' votes coming from the manufacturing and steel industries, the swing implies it's due to jobless (poor) and/or working class voters, the exact demographic you say was not the determinant.