For example, last month, 75 percent of respondents who said they were Republicans said they had an unfavorable view of the law, while 16 percent had a favorable view, and 9 percent didn't know.
By contrast, in January 2014, 81 percent of GOP respondents said they had an unfavorable view of the law, while 9 percent had a favorable view, and 10 percent didn't know.
The pickup in support for the law coincides with a big improvement in a key feature of the law: the creation of public insurance exchanges in which lower-income individuals can use federal premium subsidies to purchase coverage.
In January 2014, many of the exchanges were still suffering from technology-related problems that made it difficult for applicants to smoothly choose from exchange plans and obtain coverage.
Today, those problems, observers say, have largely eased. During the latest 2015 open enrollment season, nearly 11.7 million people selected plans in the federal and state health insurance exchanges, the U.S. Department of Health and Services reported In March, a big jump over last year's open enrollment season when just over 8 million opted for exchange coverage.
In all, 14.1 million previously uninsured adults have gained coverage due to the healthcare reform law since October 2013, HHS said.
The Kaiser polls are conducted by telephone and have between 1,200 and 1,500 respondents.
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This report appeared on the website of Business Insurance magazine, a Chicago-based sister publication of Tire Business.
