The Mueller Report w/ Nichols; Our Climate Moment w/McKibben; Plus: Gary Stewart on Girl Groups

The Mueller Report--we have the evidence, especially on obstruction; now Congress needs to do its part. John Nichols reports. Plus: Our Climate Moment: we talk with Bill McKibben about balancing fear and hope in the face of the grim realities of climate change -- his new book is "Falter: Has the Human Game Begun to Play Itself Out?" Also: Gary Stewart, activist, organizer, and popular music maven, passed away last week -- we remember him, with an interview from 2005--on Girl Groups.