Many experts say the huge pool of uninsured people in these states compounds the challenge of coping with the outbreak in several different ways, from leaving a large number of residents with underlying conditions that increase their vulnerability to the disease to extending the outbreak's spread by discouraging the uninsured from seeking early testing and treatment.

The new pressures emerging as the virus migrates to low-insurance Sun Belt states -- after striking first primarily in Northern and Western states that expanded Medicaid, almost all of which have lower uninsured rates than the national average -- is only one of the several respects in which the outbreak is raising the stakes in the debate over the ACA's future.

All of this could make the political debate over health care even more central in 2020 than it was in 2018, when Democratic promises to defend the ACA, and in particular its provisions protecting patients with preexisting conditions, were pivotal in the party's sweeping midterm election gains.

"All the same reasons that it was [important] in 2018 are in effect now, and all the [arguments] in the middle of a pandemic are even more potent," says Democratic pollster Nick Gourevitch.

Republican pollster Gene Ulm disagrees. He says that concerns directly relating to the coronavirus outbreak -- such as whether businesses and schools can reopen safely -- are eclipsing all other issues this year. "All the oxygen has just been squeezed out," he says. "Health care before meant, 'Will I be able to get coverage? How much will I have to pay for it?' Now it's all the Covid."

But Democrats are betting heavily that Ulm and other Republicans who share that perspective are wrong. Majority Forward, the issue advocacy arm of the Senate Democratic leadership, and the Senate Majority PAC, its campaign super PAC, are once again stressing health care more than any other issue in their advertising against Republican senators this year.

"I think health care -- to the surprise of a lot of people, maybe most directly Republicans -- is more urgent and even a greater priority than it was two years ago," insists J.B. Poersch, the president and CEO of the Senate Majority PAC.

Many experts believe the pandemic and the ACA could be connected in an even more visceral way in the weeks ahead. The reason: Most expect that insurance companies are likely to define exposure to coronavirus as a preexisting condition. That means many of the millions of Americans who have contracted the disease could face higher premiums and less access to coverage and care if the administration's lawsuit (and Republican legislative proposals throughout Donald Trump's presidency) to repeal the ACA's protections prevails.

"There's no question in my mind that insurance companies would treat Covid-19 as a preexisting condition if they were allowed to," said Larry Levitt, executive vice president for health policy at the nonpartisan Kaiser Family Foundation. That prospect, he adds, "connects the dots in a very tangible way between the ACA and the pandemic."

2018 vs. 2020

Democrats are again stressing the issue of preexisting conditions in House and Senate races this year. Majority Forward and the Senate Majority PAC have run television ads lashing GOP senators from Cory Gardner in Colorado and Martha McSally in Arizona to David Perdue in Georgia, Steve Daines in Montana and Thom Tillis in North Carolina for their votes earlier in Trump's term to repeal the ACA and its measure barring insurers from selling coverage at higher prices to patients with preexisting conditions.

These exchanges largely reprise the debate between the parties from 2018, albeit in the more highly charged atmosphere of the coronavirus crisis. But the outbreak -- combined with the ACA lawsuit -- may also be broadening the health care debate to focus more than in 2018 on the law's efforts to expand coverage to the uninsured.

"When you talk about the sheer number of people that aren't covered in a public health crisis, that is very relevant to the moment. That matters," says Poersch.

Republicans are generally countering Democratic calls to protect the ACA or to expand coverage to the remaining uninsured by accusing the party of seeking a government takeover of health care.

"Democrats showed the entire country what their objectives are on health care during the presidential primary: a government-controlled plan that seeks to eliminate employer-based coverage," Jesse Hunt, communications director for the National Republican Senatorial Committee, said in an email. "All roads lead to that outcome."

The issue of ensuring coverage during a pandemic, particularly by expanding Medicaid, is surfacing in races around the country.

But the issue may be most pointed in the primarily Sun Belt states that have refused to expand Medicaid under the ACA and thus remain among the states coping with the largest share of uninsured residents even as their coronavirus caseloads spike.

How they're campaigning

In North Carolina, where Republican state legislators have repeatedly blocked efforts by Democrats to expand Medicaid eligibility, the Senate Majority PAC has stressed the issue in its advertising against Tillis, who before his election to the US Senate helped lead the fight against Medicaid expansion as the GOP speaker in the state House of Representatives.

In Alabama, Democratic Sen. Doug Jones, who faces a difficult fight for reelection in a state where Trump romped in 2016, is running an ad where he endorses Medicaid expansion for the state and declares: "Too many folks face the Covid crisis without health care coverage."

In Texas, the issue is especially acute, both because it is the largest state that has not expanded Medicaid and because Republican Attorney General Ken Paxton has led the coalition of GOP states suing to invalidate the ACA. Democratic House candidate Sri Preston Kulkarni, who is running strongly for an open Republican seat outside Houston, one of the outbreak's epicenters, has stressed health care throughout his campaign and unequivocally insisted that Texas should expand Medicaid eligibility.

Likewise, Democrats are promising to expand Medicaid in their uphill, but achievable, bid to win control of Texas' state House of Representatives for the first time in years. Texas' coronavirus crisis "has brought in a very crystallized way the reality of what life is with health care, and what life is without it," says Democratic state Rep. Trey Martinez Fischer of San Antonio.

Contrary to the Democrats, Ulm says that in his research voters are not linking the outbreak with either the debate over protecting preexisting conditions or Trump's efforts to repeal the ACA. "It's not how people are looking at it," he says. "It's just not. They are looking at it more like: No one seems to understand this [disease]."

Such repositioning may reflect the enormous pressure that the coronavirus outbreak is imposing on health care systems, particularly in the states already strained by the large number of uninsured. The big uninsured population "makes it exponentially worse" to cope with the surge, says Texas state Rep. Fischer Martinez.

Challenges for non-expansion states

Medical experts say that the Sun Belt states have one big advantage over the states hit earlier this spring: Hospitals have developed more expertise on how to treat victims and reduce mortality. But in many other respects, experts say the large number of uninsured in many of these states complicates their situation. These challenges include:

In the presidential race, the coronavirus outbreak has eclipsed all other issues to the point that the health care debate hasn't been engaged as directly as in many of the Senate and House contests. But the virus' turn into the low coverage states that refused to expand Medicaid could eventually provide a vivid backdrop for one of the sharpest policy differences between Trump and presumptive Democratic nominee Joe Biden.

CNN's Tami Luhby contributed to this report.

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How the coronavirus is shaping health care politics in 2020 - CNN