This essay applies some of the key insights in Bryan Caplan's The Myth of the Rational Voter. We discuss the relevance of cheap signals in political systems as well as the relevance of ideas in public policy with ‘rationally irrational’ voters. We add a fifth bias, ‘stick-it-to-the-man bias’, to Caplan's proposed anti-market, anti-foreign, make-work and pessimistic biases, and we apply them all to environmental policy.