The first really substantive part of the "syllabus" or executive summary of the Supreme Court decision upholding the individual mandate and the ACA looked like Armageddon for the Administration:
2. CHIEF JUSTICE ROBERTS concluded in Part III–A that the individual mandate is not a valid exercise of Congress’s power under the Commerce Clause and the Necessary and Proper Clause. Pp. 16–30....That is a straight exposition of the plaintiffs' core argument. Congress cannot create commerce; Congress cannot regulate inactivity; Congress cannot compel commerce. It's a miracle that Roberts turned around and upheld the mandate as an exercise of Congress's taxing power. But hasn't this decision dealt a blow to Congress's power to regulate commerce? Does it kick off a rollback of the series of decisions in Roosevelt's second term that expanded that power?
Construing the Commerce Clause to permit Congress to regulate individuals precisely because they are doing nothing would open a new and potentially vast domain to congressional authority. Congress already possesses expansive power to regulate what people do. Upholding the Affordable Care Act under the Commerce Clausewould give Congress the same license to regulate what people do not do. The Framers knew the difference between doing something and doing nothing. They gave Congress the power to regulate commerce, not to compel it. Ignoring that distinction would undermine the principle that the Federal Government is a government of limited and enumerated powers. The individual mandate thus cannot be sustained under Congress’s power to “regulate Commerce.” Pp. 16–27.
Probably not. Congress's right to compel purchases is a conservative worry, not a liberal one. Verrilli's core "limiting principle" was essentially that insurance is unique (because you never know when you'll need the benefits), and health insurance a singularity within that singularity (because if you lack it, your fellow citizens will ultimately foot much of the bill). And he meant it!
In his reply brief, Verrilli identified democratic accountability as the ultimate limiting principle that would confine the purchase mandate to health insurance: