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Republican governors are scrambling to come up with a response if the Supreme Court cripples ObamaCare, leading to a tangle of divergent views that could make it tougher for the GOP to rally around a single solution. Political pressure on Republican governors to act will be intense if the high court invalidates subsidies that help millions of their states’ citizens buy health insurance. (Sullivan, 3/12)

If the Supreme Court rules this summer that federal-run Obamacare exchanges can't provide health insurance subsidies, the results could be chaotic for those receiving the financial aid across the country — but especially in the South. About 11.7 million people have signed up for 2015 exchange plans, including 8.8 million who selected coverage in states with federal-run exchanges, the Obama administration announced Tuesday. The vast majority of those people are receiving subsidies, which on average cuts monthly premiums by 72 percent. Those size of the typical discount, though, varies by state. (Millman, 3/11)

The plaintiffs in this case — David King and three other Virginia residents – argue that the language of the ACA stipulates that insurance subsidies should only be available in states that set up their own exchanges, not states that rely on the federally run HealthCare.gov. The plaintiffs focus on language in the law about subsidies being available for those enrolled in an exchange "established by the State." The federal government, meanwhile, argues that the law, as a whole, makes clear subsidies should be available for those enrolling in any exchange, whether established by the state or federal government. (Robertson, 3/11)

King v. Burwell isn't the only challenge the ACA faces. California Healthline spoke with experts and pored over recent research to determine some of the other biggest threats to the law's viability and success. (Wilson, 3/11)