Marianne Williamson, the primary candidate infusing spirituality into the Democratic debates, sits down with Ross Douthat to discuss her journey to faith, her writings on illness and disease and how religious and spiritual language have inflected both the country’s history and the current political climate. Then, Michelle Goldberg joins Ross to debate Williamson’s candidacy, record and New Age messaging. For background reading on this episode, visit nytimes.com/theargument