Social determinants of health—such as access to appropriate housing, health care, and transportation—drive massive health disparities in the US, and many are underpinned by politics and policies. Professor and author Daniel Dawes talks with Dr. Josh Sharfstein about his new book which looks at the role of politics and health, why the "moral case" alone can't advance change, and how the health of the democratic process is key to a healthier and more equitable future.