“Thus, having transformed the individual mandate into a tax, the court may face renewed challenges to ObamaCare on uniformity grounds. The justices will then confront a tough choice. Having earlier reinterpreted the mandate as a tax, they would be hard-pressed to approve the geographic disparity created when states opt out of the Medicaid expansion. But that possibility is inherent in a scheme that imposes a nominally uniform tax liability accompanied by the practical equivalent of a fully off-setting tax credit available only to those living in certain states. To uphold such a taxing scheme would eliminate any meaningful uniformity requirement—a result that the Constitution does not permit.”