“The GAO has been issuing warnings about ObamaCare’s shaky budget assumptions for a while now, but this is the first time it’s put a concrete number against it. Still, bad as this $6.2 trillion deficit boost is, the real figure is likely to be much higher, since the GAO is still being far too optimistic about the rest of ObamaCare. Here are five big assumptions the GAO makes that aren’t likely to hold true.”