If you’re looking for more reading on the subject of public vs. private insurance administrative costs, see pages 45-47 of Administrative Solutions in Health Reform, an RWJF-sponsored report by the National Academy of Public Administration and the National Academy of Social Insurance (2009). Because I don’t care to engage in a debate on the issues it raises (though feel free to discuss among yourselves in the comments), I’m not quoting it. It’s ungated, and you can read and judge it for yourself. (Direct link to the PDF here.)
Also, I want to second Aaron’s promotion of “What Dilemma? Moral Evaluation Shapes Factual Belief“ (also ungated). It’s worth reading. I just did.