Prior to launching Healthcare.gov, the estimated cost of building the ObamaCare exchange website had already reached as much as $1 billion. Of course, doing it properly should have cost far less, and that number doesn’t include fixing what wasn’t done right the first time. But HHS Secretary Kathleen Sebelius told Congress Wednesday that her estimate is now $677 million – $47 million more than her last congressional check-in. But not to worry: She’s demanded a full investigation into the failed management of the Healthcare.gov rollout … that she managed.