One of the biggest changes in politics in my lifetime is that the delusional is no longer marginal. It has come in from the fringe, to sit in the seat of power in the oval office and in Congress. For the first time in our history, ideology and theology hold a monopoly of power in Washington. Theology asserts propositions that cannot be proven true; ideologues hold stoutly to a world view despite being contradicted by what is generally accepted as reality. When ideology and theology couple, their offspring are not always bad but they are always blind. And there is the danger: voters and politicians alike, oblivious to the facts.
--From Bill Moyers' acceptance speech for the Center for Health and the Global Environment at Harvard Medical School's Global Environment Citizen Award. (PDF version here. Thanks Maria for pointing this one out...)