In an exclusive interview, the former president identifies the greatest threats to the American experiment, explains why he’s still hopeful, and opens up about his new book. A painting of Barack Obama Jordan Casteel. Photo of painting: David Schulze Story by Jeffrey Goldberg Painting: JORDAN CASTEEL, BARACK, 2020. OIL ON CANVAS, 30 x 45”. COURTESY THE ARTIST AND CASEY KAPLAN, …