There's a more common name for irrationalists in politics: "wingnuts." But I think that particular word is both inaccurate and falsely comforting, since it suggests that irrationalists are marginalized on the edge of political discourse. A hint for you: When an irrational politician sleeps in the White House, irrationalism is not exactly marginalized. Irrationalists aren't wingnuts; they're not even the wings. They're the damned fuselage of political discourse at the moment, and I think that's pretty damn scary.
Bush's irrationalist tendencies have fundamentally little to do with his conservative tendencies, which is to say that the former are not spawned from the latter. God knows irrationalism lies on both sides of the conventional political spectrum; the irrationalists of the left who tried to expunge "dead white guys" from curricula back when I was still in school to my mind walk arm and arm with the irrationalists on the right who are now busily trying to expunge evolution. An irrationalist liberal in the White House would be no better than Bush, that's for sure.
Though was there ever a time when rationalism held sway over politics, as opposed to public discourse being buffeted by impulses, fashions, superstitions, waves of mass hysteria and the effects of human cognitive biases which probably made excellent sense on the hunter-gatherer savannah? This has been the case in Plato's day and Shakespeare's, and will probably be so throughout the future of humanity. When the post-singularity nanobot hives populated by the uploaded personalities of our distant descendants launch for outer space in 500 years' time, chances are their politics and public discourse will be just as dominated by prejudices, phobias, omens, superstitions and kneejerk reactions as they are now.
Nonetheless, while rationalism is, to some extent, a lost cause, it is one worth taking up. Sure, if you take up the rationalist banner, the multitudes may laugh at you, call you a crank and sometimes throw things at you, but with patience and perseverance, you can persuade a few people and make the heavily-armed madhouse that is the world slightly less psychotic. At least until the next wave of mass excitement sweeps through it, anyway.
On a tangent, Australian lefty cultural commentator Phillip Adams on politicians and other leaders embracing irrational beliefs, from Reagan's Apocalyptic Christianity and Blair's taste for new-age mumbo-jumbo to the Australian founding fathers' fondness for the Victorian spiritualist fad and Gandhi's reliance on soothsayers before nuclear tests.
It's certainly a recurring theme in politics. One wonders, though, whether it's a case of (a) everybody being a bit kooky, and the media amplifying this in public figures, (b) politicians being (for some reason) more irrational than the man on the street, or (c) successful politicians realising that it pays to pander to irrational beliefs, and that rationality is punished. (Look, for example, at Al Gore, and his image of being a heartless, calculating robot-like being. Never mind that he had embraced the whacko anti-technology mystical-primitivist side of the environmental movement some years before that; perhaps he just wasn't fluffy enough.)
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