The Patient Protection and Affordable Care Act is a comprehensive federal statute that attempts to extend health insurance coverage to tens of millions of Americans and to expand health insurance coverage by eliminating exclusions for preexisting conditions, increase medical loss ratios, abolish annual and lifetime limits, and other reforms. A necessary provision of this law (the individual mandate) requires most individuals to maintain health insurance coverage. The individual mandate has been challenged in a number of lawsuits on the ground that Congress lacks the power under the Constitution to require individuals to purchase health insurance. The power of Congress to enact the individual mandate may be questioned only by returning to ...