The health insurance mandate proposed by Clinton is similar to the one enacted in Massachusetts under former Gov. Mitt Romney and the plan proposed by Gov. Arnold Schwarzenegger for California. These "unfunded mandates" are unlike any form of government regulation we've seen.
In making the case for her plan to mandate private health insurance, Clinton said in a recent Democratic debate that not doing so "would be as though Franklin Roosevelt said, 'Let's make Social Security voluntary,' or if President [Lyndon] Johnson said, 'Let's make Medicare voluntary.' "
In fact, under the law, there's a big difference between participation in a government health program funded by taxes and privatizing such a program, with individuals forced to purchase private health insurance.
Taxation involves representation, as when Congress appropriates money and controls a government program for the general welfare. This describes Social Security and Medicare. But government cannot simply delegate its taxing powers to private business.