Built in to obamacare is a federal real estate tax not indexed to inflation which over time snares more and more property owners as home values increase.
The Obamacare tax is on investment income (which includes profits on the sale of a house). It is just another example of how the democrats always seem to vote tax laws that screw the middle class. This time they just wanted money to fund the subsidies, and like always, they took it out of middle class hides, instead of the rich, who one would normally think would be the tax targets of so-called "liberal democrats." They could easily have placed a higher threshhold on the tax, so that it would apply only to, say, investment income over $1 million. Or they could have instituted a tax of a penny per share on all stock transactions which no one but the ultra rich and investment companies would notice. But no, the democrats, talk as much as they do, never want to offend the ultra rich by making them pay their fair share of taxes. So much easier to go on screwing the middle class of the country. The democrats are not "liberal" at all when it comes to taxes.
Just wait - in a couple years these so-called "liberal" democrats will vote to cut social security or increase the retirement age of laborers to 70+ - knowing that many of them will not live that long. The liberalness of the democratic party is as genuine as the sewn-in smile on their house majority leader.