When UnitedHealth, the nation’s largest health insurer, announced earlier this month that it would exit the Affordable Care Act exchange business in all but three states, the obvious question was, who’s next? After all, if the nation’s biggest health carrier can’t make the Obamacare exchanges profitable, who can? UnitedHealth announced it expects to lose $650 million on its ACA business in 2016, although its first-quarter earnings beat analyst expectations, thanks to the company’s highly profitable consulting and technology businesses.

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For years, voters in this swing state have rejected tax increases and efforts to expand government. But now they are flirting with a radical transformation: whether to abandon President Obama’s health care policy and instead create a new, taxpayer-financed public health system that guarantees coverage for everyone.

The estimated $38-billion-a-year proposal, which will go before Colorado voters in November, will test whether people have an appetite for a new system that goes further than the Affordable Care Act. That question is also in play in the Democratic presidential primaries.

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