The surprising issue that could determine Obamacare's future

Whether Obamacare survives its latest trip to the Supreme Court surprisingly could come down to a question of the federal government's power over the states. After nearly 90 minutes of oral arguments Wednesday, there's generally agreement the expected ruling in the case -- questioning the legality of subsidies for millions buying health insurance through 34 federal-run exchanges -- is too close to call. Chief Justice John Roberts, the pivotal swing vote upholding the Affordable Care Act three years ago, gave away nothing that would show which way he's leaning. Justice Anthony Kennedy, who voted to strike down the entire law last time, asked tough enough questions of both the plaintiffs and the federal government that indicated his vote could be in play.