“Healthcare.gov on Dec. 1 is night and day from where it was on Oct. 1,” Jeff Zients, who was brought in to oversee fixes to the troubled Obamacare website, declared during a Sunday conference call. But that statement says more about how badly the website was functioning on its launch date than it says about how well the site is functioning now. Starting in late October, Zients declared that the website, which is supposed to enable residents of 36 states to sign up for insurance through President Obama's health care law, would be functional for a “vast majority” of users...