http://www.plosone.org/article/info:doi ... ne.0042366
The study also reached several conclusions regarding temperaments typical of libertarians (and those of other political orientations) which suggest that libertarians are most prone to skepticism, detachment and rational thinking. In the past few decades much research has been geared towards examining how political opinion aligns with personality and other mental characteristics, and recently this research has begun to see significant use in political science, analysis and commentary. The findings are not entirely uncontroversial, as many object to the implied deterministic conception of their positions as undermining the need for reasoning in political discourse. However, if this study is anything to go by, libertarians have a strong tendency towards the use of reason, rather than emotion, in informing policy.

