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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