In 1913 the progressive income tax was ratified, and it became Constitutional to tax people based on the amount of money they made. Thus, the more you make, the more you pay. While those who championed it "promised" taxes would never exceed 7% on the top income brackets, within three years the top income tax rate was a whopping 75%.
This "amendment" ultimately gave the government the power to treat some Americans different than others depending on what they bought and how much money they made. This was one of the culminating successes of the progressive movement, and a culmination of the Woodrow Wilson Presidency.
The U.S. Constitution notes that "All men are created equal." This amendment assured that those who make more money, or achieve, are taxed at a different level than those who do not succeed, or make less, and therefore was a culminating moment for the progressive movements attempt to take from the rich and give to the poor.
It is this amendment that the the Obama administration is using to say that Obama care is Constitutional. They see "Mandatory Healthcare" as just another way of taxing people. Whether this argument will stand over the 10th amendment, which notes that the states have a right to sovereignty over anything not "hereby" mentioned in "this here Constitution."
Thus, Obamacare makes it legal to take from those who make a lot of money in order to "subsidize" or provide "for free" to those who can't afford their own healthcare insurance program.
Sure this all sounds good on the surface, but it's all proof that the founding fathers were correct that the government, given an inch of power, would ultimately create too much government, which ultimately, and by nature, takes away freedom from the people. The more powerful the government, the less powerful the people (i.e., the states).
The progressive tax actually allows the government to say, well, you make more than him, so you should pay higher taxes on this. And you make more than him, so you should make more money than him. And, thus, the government has the power to "unfairly" tax people.
Ultimately, the progressive tax of 1913 led to an 80,000 page and corrupt tax code, and now a healthcare program that is equally unfair to those who achieve. The solution to this mess is a flat tax. A flat tax would make sure that all Americans are taxed equally. If you make $20,000 a year, you pay 11.5%. If you make $1,000,000,000,000 you pay 11.5%.