Digby sends us to Chris Mooney on how conservatives become less willing to look at the facts, more committed to the views of their tribe, as they become better-educated:

For Republicans, having a college degree didn’t appear to make one any more open to what scientists have to say. On the contrary, better-educated Republicans were more skeptical of modern climate science than their less educated brethren. Only 19 percent of college-educated Republicans agreed that the planet is warming due to human actions, versus 31 percent of non-college-educated Republicans.

…

But it’s not just global warming where the “smart idiot” effect occurs. It also emerges on nonscientific but factually contested issues, like the claim that President Obama is a Muslim. Belief in this falsehood actually increased more among better-educated Republicans from 2009 to 2010 than it did among less-educated Republicans, according to research by George Washington University political scientist John Sides. The same effect has also been captured in relation to the myth that the healthcare reform bill empowered government “death panels.” According to research by Dartmouth political scientist Brendan Nyhan, Republicans who thought they knew more about the Obama healthcare plan were “paradoxically more likely to endorse the misperception than those who did not.”

What this made me think about was the way Christy Romer ended her excellent speech (pdf) laying out what we know about the effects of fiscal policy.:

The one thing that has disillusioned me is the discussion of fiscal policy. Policymakers and far too many economists seem to be arguing from ideology rather than evidence. As I have described this evening, the evidence is stronger than it has ever been that fiscal policy matters—that fiscal stimulus helps the economy add jobs, and that reducing the budget deficit lowers growth at least in the near term. And yet, this evidence does not seem to be getting through to the legislative process. That is unacceptable. We are never going to solve our problems if we can’t agree at least on the facts. Evidence-based policymaking is essential if we are ever going to triumph over this recession and deal with our long-run budget problems.

What Chris Mooney is telling us is that this is a vain hope. Highly educated political conservatives — and this includes conservative economists — are going to be less persuadable by empirical evidence than the man or woman in the street. The more holes you poke in doctrines like expansionary austerity or supply-side economics, the more committed they will get to those doctrines.

This debate isn’t going to be won by rational argument.