These latest poll findings, which are consistent with surveys taken since the Affordable Care Act passed in 2010, show how much work is left to be done by the White House and others who want the largest expansion of health care in decades to succeed. The Kaiser Family Foundation polled Americans from Sept. 12 to Sept. 18.

Just 15 percent of those polled, and only 12 percent of the working-age uninsured, knew the exchanges were launching in October for the start of a six-month sign-up period. Sixty-five percent of respondents were aware that Obamacare created the exchanges, however.

The survey found that more than three years after the law’s enactment, 51 percent of Americans felt as though they didn’t understand it well enough to determine how it will affect them and their families. More than two-thirds of the uninsured — those who stand to gain the most — said the same. More than half of respondents said the news media focuses mainly on the politics of health care reform, rather than on how it affects people. A majority also said there was no news source they could trust to provide information about the law.