The association of self-regulation and personality factors with rational decision making was investigated using an experimental model of political voting. The results revealed different sets of personality characteristics for rational and emotional voters. A self-regulation/personality typology of decision making was then constructed, and traits representing self-regulation, cognition, and personality were examined as predispositions toward rational decision making. As a result, specific connections among these variables were uncovered, through which the primary role of the conscious self-regulation system in the management of rational decision making in a political voting context was established.