This year's open enrollment under the Affordable Care Act is about to close, with almost 10 million people having signed up so far. Some six million could be in for a big surprise as the US Supreme Court might decide they're not entitled to subsidized health insurance after all. Most of them don't even know they might lose the new coverage they couldn't afford on their own. Now Republicans — who've failed to repeal Obamacare in Congress — could face a hornet's nest of angry constituents if the Court guts the law for them. Both sides are jockeying for political advantage as the Court prepares to hear arguments and make a decision.