Mark Landler has written a book : Alter Egos: Hillary Clinton, Barack Obama and the Twilight Struggle over American Power. I have not read the book yet , but I found the review by Roger Harrison in The America Interest, The Ballad of Barack and Hillary, quite thought-provoking.
In my last post I suggested that Hillary as president would be a predictable quantity. This article lays out just what we can predict, at least in foreign policy, so it is worth reading.