“Government officials have missed several deadlines in setting up new health-insurance exchanges for small businesses and consumers—a key part of the federal health overhaul—and there is a risk they won’t be ready to open on time in October, Congress’s watchdog arm said. The Government Accountability Office said federal and state health officials still have major work to complete, offering its most cautious comments to date about the Obama administration’s ability to bring the centerpiece of its signature law to fruition.”