That's the thing, though, CBO wasn't all that far off.  It remains the most accurate prediction made at the time, and generally called the effects of the law accurately. If you look at the numbers, the margins are small. Pretending otherwise may support a partisan narrative now that the shoe is on the other foot, but that is a foundation built on sand.
http://www.factcheck.org/2017/03/cbos-obamacare-predictions-how-accurate/