Show Summary: A month ago almost no one had heard of Cambridge Analytica. But when the Facebook data story blew open, one of the names involved was mighty familiar: Mercer. Robert Mercer and his daughter Rebekah – he an investor, she on the board – moved into prominence with the publication of investigative reporter Jane Mayer’s book, Dark Money. The book and our original interview with her – recorded last fall – provides key background to this new story. This week we air it again, to share that context.