By that standard, i cannot imagine a single thing that the federal government is not empowered to do.
General Welfare is such a stretch few mention it. The poor, overworked interstate commerce clause SHOULD be a joke. A major health insurance reform I would support would allow me to shop for insurance across state lines.
On its face, I hold this absurdity lacks Constitutional foundation, but the Constitution is whatever the SCOTUS of the day says it is. McCain/Feingold and Kelo taught me never to bet the farm on what Scotus will do.
Its the consent of the governed, that is not a standard, that is reality. The Constitution isn’t a natural law like gravity that happens automatically, it has to be enforced by people. We are not enforcing it and the tyrants are laughing in our faces daring us to enforce it, just like bullies.