The White House doors may have closed on former President Barack Obama’s presidency, but for him and his wife Michelle, the path to lucrative new book deals and paid speeches is wide open. The Obamas recently hired top-dollar attorneys Robert Barnett and Deneen Howell to handle their book contracts, and a high-profile public relations agency — known for repping the Clintons and Mia Farrow — to coordinate speaking appearances. The Obamas haven’t yet set book-release dates or announced any scheduled speeches. The Harry Walker Agency, which exclusively represents former President Bill Clinton, former Secretary-General of the United Nations Kofi Annan,...