With all the problems facing the rollout of President Barack Obama’s health care overhaul, nowhere is the situation worse or more surprising than in Oregon, a progressive state that has enthusiastically embraced the federal law but has so far failed to enroll a single person in coverage through the state’s insurance exchange. Despite grand ambitions, an early start, millions of dollars from the federal government and a tech-savvy population, Oregon’s online enrollment system still isn’t ready more than a month after it was supposed to go live. The state has resorted to hiring or reassigning 400 people to process insurance...