The first study, from the Kaiser Family Foundation, looked at the experience of the uninsured in California, whose government wholeheartedly embraced the ACA when it was passed into law.
That research, which checked in with a pool of uninsured people over the past two years, found that 68 percent of previously uninsured adults in California obtained health coverage in the years since 2014, when Obamacare's full provisions took effect.
It also found marked decreases in the number of people having difficulty paying for health care and getting access to health care during that same time frame.
The biggest single driver of getting those people coverage, by far, was Medi-Cal, the Golden State's Medicaid program, where 34 percent of the previously uninsured obtained coverage.
California was among the earliest of what are now 30 states to have expanded eligibility of their Medicaid programs, which typically provide coverage at no charge to recipients, to include nearly all poor adults. Texas so far has refused to expand its Medicaid program to that population, despite the ACA's provision that the federal government will cover the lion's share of the costs from the newly eligible.
Another 14 percent of the previously uninsured reported getting covered by employer-based health insurance, Kaiser said. And 12 percent said they had gotten coverage though Covered California, the state-run Obamacare insurance marketplace, which has more than 1 million customers in plans sold by private insurers, according to the study.
Mollyann Brodie, who is in charge of Kaiser's public surveys, said the results of the study "certainly suggests that California has been incredibly successful at enrolling the uninsured."
Pointing to the large share of the gains realized by Medi-Cal enrollment, Brodie said, "you can immediately see why those states [that have not expanded their Medicaid programs] are a lot less successful" in reducing their uninsured rates.
Brodie also said that while California's reduction in the numbers of previously uninsured is "significant," she was more struck by the big drops in the number of people who have difficulty paying for and getting health care.
Two years ago, 86 percent of the then-uninsured people who since have obtained coverage said they had a very or somewhat difficult time paying for their or their family's health care. That dropped to 49 percent of those people by this past spring. The percentage of such people who had any problems paying medical bills in the previous 12 months was cut nearly in half, from 45 percent to 23 percent.
And, "when asked how well their health needs are being met, 86 percent of the recently insured now say that they are being somewhat or very well met—up from about half (51 percent) in 2013," the report found.
"I was surprised at the size of those changes," Brodie said,