The CNN poll surveyed 1,023 adults from March 11-13. The poll has a margin of error of +/- 3.0 percentage points.
By comparison, a recent Gallup poll that asked Americans whether it was a "good thing" or a "bad thing" that Congress passed the law found that 46 percent said it was a good thing while 44 percent said it was a bad thing. The split was very similar to the 49/40 "good thing"/"bad thing" split in a Gallup poll conducted a year ago, just before the law was signed.
While a plurality said it was a good thing the law passed, 44 percent said it would worsen medical care in the U.S., compared to 39 percent who said it would improve care. Americans were also skeptical of the impact on their own care, with 39 percent saying it would worsen their care, and just 25 percent saying it would improve their care. 31 percent said it would not change their own care.
The Gallup poll surveyed 1,038 adults from March 18-19 and has a margin of error of +/- 4.0 percentage points.