Psychological research (Carney et al 2008) suggests that liberals score higher on "Openness to Experience" (a Big Five personality trait). This trait correlates with a preference for novelty, ambiguity, and critical inquiry.

In a carpenter maybe that's not so important, yes. But if you're running a startup or you're in academia or if you're working with people from various countries, etc you might prefer someone who scores highly on openness.