WASHINGTON (AP) — Public support for President Barack Obama's health care law is languishing at its lowest level since passage of the landmark legislation four years ago, according to a new poll.

The Associated Press-GfK survey finds that 26 percent of Americans support the Affordable Care Act. Yet even fewer — 13 percent — think it will be completely repealed. A narrow majority expects the law to be further implemented with minor changes, or as passed.

Meanwhile, Obama says more than 6 million Americans have signed up for coverage through the new health insurance markets created by his overhaul.That's a milestone, fulfilling a goal set by Congressional Budget Office and embraced by the White House.

Monday is the deadline to enroll in the new insurance exchanges, although many people will still be able to take advantage of extensions announced this week.  

Six million sign-ups is an achievement, considering the HealthCare.gov website didn't work when it was launched last October.

It's still short of the original target of 7 million. And there's no word on how many consumers have sealed the deal by paying their premiums.