First, whenever you see an analysis that begins with a phrase similar to, "We need to find a way to convince low-income/rural/evangelical whites to stop voting against their own self-interest," stop reading. If we start from the premise that we know what people’s interests are better than they do themselves, that’s part of the problem. People have many interests and motivations. If what liberals want them to do is put their economic interest above others, they should be clear about that, and explain why we should prefer people to prioritize their economic interests over others.

• Short Term/Long Term - It might be in my short term economic interest to vote for the confistation and conveyance (to me) of my neighbors house...but it is contrary to my long term economic interests. (i.e., I don’t want my house confiscated one day, and I don’t think such uncertainty/instability is good for my economy)
  
  
• Fairness - while the Democrats tend to define fairness by equality of outcome--too high/too low salaries are "problems" that need legislative remedy--others define it by the process. While an Estate tax may provide economic benefit for those of us not paying it, many in "low-income/rural/evangelical" America might also regard it as an unfair practice.