Tonight on The Last Word: Donald Trump testifies in the E. Jean Carroll defamation suit. Also, the Biden-Harris campaign focuses on battleground Wisconsin. Plus, Brian Klaas says Trump benefits from "the banality of crazy." And a new film reimagines Isabel Wilkerson's book, "Caste." Andrew Weissmann, Faith Gay, Ben Wikler, and Ava DuVernay also join Lawrence O'Donnell.