An official with the Centers for Medicare and Medicaid Services told lawmakers last week that eight of the 11 remaining Obamacare co-ops have been selected for "corrective action plans" and "enhanced oversight." Twenty-three co-ops were created under the president's health care overhaul, and so far more than half have collapsed and are no longer selling plans in the marketplace. The 12 co-ops that went out of business operated in Arizona, Michigan, Utah, Kentucky, New York, Nevada, Louisiana, Oregon, Colorado, Tennessee, South Carolina and a co-op serving Iowa and Nebraska. The agency's chief operating officer, Dr. Mandy Cohen, told the House...