Writing at his New York Times blog, Paul Krugman warned that those banking on Obamacare to collapse are "probably making a very bad bet."

As proof, Krugman points to the record of state-level healthcare exchanges, which by and large have been performing much better than their federal counterpart. He also cites the rising levels of Medicaid enrollment — which is occurring in both states that have and haven't accepted the Obamacare expansion — and the slow improvement of Healthcare.gov as reasons for optimism. All in all, Krugman says, the law is "probably going to stumble through to the finish line."

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More from Krugman at the New York Times: