A lot of conservatives think the Supreme Court whiffed the last time it considered Obamacare, in 2012, when it upheld the law's constitutionality. This time might be different, though, because this isn't a constitutional case. In 2012, Chief Justice John Roberts argued that the court had an obligation to try to read the law in a way that made it consistent with the Constitution. That reading didn't have to be the most natural one so long as it was plausible. In this case, though, the Constitution is not at issue and is therefore not a reason to read the law one way or the other.