WASHINGTON  - A new book detailing life in the White House describes high tension under the tenure of Barack Obama as First Lady Michelle Obama struggled with his top aides over the direction of his presidency. She “cherished the idea of her husband as a transformational figure” but battled with White House advisors on compromise deals he had cut with Republicans, growing frustrated that he was being viewed as an “ordinary politician,” according to the book out Tuesday by journalist Jodi Kantor.