In the end, Obamacare is going to be judged by whether it has successfully reduced the number of uninsured Americans. But with a few weeks to go before this year's deadline to sign up, whether the law has made much progress toward that goal isn't yet clear -- though there are signs that it's picking up momentum in the private market.
More than four million Americans have enrolled in private coverage under the law, according to the Obama administration, and the law will likely come closer to the Congressional Budget Office's initial projection of seven million enrollees than most would have thought possible after HealthCare.gov's disastrous launch.
But how many of those enrollees were uninsured, now newly covered under Obamacare, and how many are simply signing up for new coverage to replace what they already had? A new survey has found that 27 percent of people who signed up for coverage in February were previously uninsured.
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