The US Supreme Court has found the Affordable Care Act constitutional, a major victory for President Obama. The decision was written by Chief Justice John Roberts, who sided with four liberal colleagues against conservatives, splitting the court five to four. The "mandate" requiring all Americans to buy health insurance was upheld — but the majority called it a "tax" — and that gave Mitt Romney an opening. House Majority Leader Eric Cantor said today he'll introduce a bill to repeal the Affordable Care Act when Congress returns to Washington. We hear about today's opinion, and what it could mean for the availability of healthcare, the presidential campaign and the powers of Congress.