The unique dual arrangement announced Tuesday is for books that are among the most anticipated in memory from a former president and first lady. Barack Obama is widely regarded as one of the finest prose stylists among modern presidents, and his million-selling "Dreams from My Father" and "The Audacity of Hope" are considered essential to his rise to the White House. Michelle Obama has given few details about her time as first lady: Her only book is about food and gardening, "American Grown," released in 2012. Both Obamas are widely popular with the public in the U.S. and abroad.