Do you think the "rationalist" idea exists in and is dominant or subordinate in (american) politics?
As for economics, once again we have a situation where rationalism falls short of natural processes. Most rationalists see the free market as chaotic and not governed by sound reason. They are right. The free market is governed by every shlub that has ever purchased anything. Socialism, on the other hand, is run by pure reason. It is irrational to say that socialism is better than capitalism, but its perfectly rational to say that capitalism is an irrational process. Once again, a natural, irrational process defeats its rational competitor. Again, however, a truly rational person would acknowledge this. Problem is, most people that consider themselves rational do not. Economics can be applied to the majority of political decisions, not just those involving the economy, which is why I say its not considered nearly enough.
Could you elaborate on your last statement? How do economics affect political decisions so much that they should be considered more than they are?
I think that liberals are more rationalistic than conservatives. Thats why liberals advocate so much foolishness. I recommend "The Counter Revolution of Science: Studies on the abuse of Reason" by F.A. Hayek. I think Hayek's conception of the "Scientistic Approach" is analagous to a rationalistic approach.
Consider the fact that of all the congressional and senatorial seats available, only 1 or 2 are occupied by economists, and the rest by lawyers.