… … we absolutely do know that the Republican war on reason is in full swing, and we know that is more destructive than any imaginable marginal political gain.
The GOP push the agenda of their religious wing. I assume this is the “war on reason” you mean?
This war has resulted in growing restrictions on abortion, on creationism in some curriculum, and so on. All these are concrete political consequences that ought to be weighed against other concrete political consequences – on health-care, deficits, etc.
Using his pulpit, I think a president can have some impact on the way a culture’s ethical viewpoint at the place it meets politics. He can focus on everyone moving toward the shining city on the hill, or he can ask for shared sacrifice, or he can raise class-consciousness. In this area, I think Obama is a disaster. of all the things he actually gets away with, his rhetoric is probably the worst.
Using his pulpit, I don’t think a president can have any impact on reason and epistemology of the culture. I agree that these are fundamental, but to change these, one has to change intellectuals rather than political parties. One probably has to change the views of journalists before one can change the views of voters. If one can change the views of people in think tanks and professors it can have an impact on journalists. Mostly, politicians reflect these intellectuals when it comes to fundamental areas of philosophy like epistemology.