In May 2010, two months after the Affordable Care Act squeaked through Congress, President Obama's top economic aides were getting worried. Larry Summers, director of the White House's National Economic Council, and Peter Orszag, head of the Office of Management and Budget, had just received a pointed four-page memo from a trusted outside health adviser. It warned that no one in the administration was "up to the task" of overseeing the construction of an insurance exchange and other intricacies of translating the 2,000-page statute into reality. Summers, Orszag and their staffs agreed. For weeks that spring, a tug of war played out inside the White House, according to five people familiar with the episode