By Paul Krugman
For advocates of health reform, the story of the Affordable Care Act, a.k.a. Obamacare, has been a wild roller-coaster ride.
First there was the legislative drama, with reform seemingly on the edge of collapse right up to the moment of passage. Then there was the initial mess with the website — followed by incredibly good news on enrollment and costs. Now reform has hit a pothole: After several years of coming in far below predictions, premiums on covered plans have shot up by more than 20 percent.