Supreme Court Deliberations

Well, after 3 days of questions and testimony, the Supreme Court will deliberate the Affordable health Care Act, better known as ObamaCare. And no matter which side you're on, there is one thing I really don't understand. Why did it go in front of the Supreme Court? This is a bill that stops insurance agencies from denying coverage for a pre-existing illnesses, allows but doesn't require children to stay on their parents' policies until they are 26, allows states to opt out of the bill if they have a better idea to cover every one by 2017, and beginning in 2014 requires all people to have insurance, the individual mandate part of the bill, which was a GOP idea. That's right. The mandate hasn't started yet, and the states still have 5 years to devise their own plan. So the entire bill isn't in effect yet. So again, why was this bill in front of the Supreme Court in 2012?