In this paper, I argue that philosophy and the social sciences are allies in the struggle to make good political decisions, ones productive of increased individual and community agency. Political deliberation is often over policy, about what should happen and about how to make it happen. People involved in public deliberation seek to identify the public good as well as the means to it. However, public policies decisions are often informed by ideologies (folk beliefs). Ideological knowledge is not optimal knowledge. Because of this, policies often do not achieve their desired results or even settle on achievable goals. Policies based on better knowledge of human behavior are more apt to be achieved thank ones based on ideological assumptions. The social sciences tend to produce this knowledge. Therefore, deliberations should include social scientific knowledge.