More recent surveys peg that figure at about four in 10, according to Filipic, who said the apparent decline represents a win for her coalition.
"We have had one-on-one conversations with thousands of individuals," she said. "We are seeing a lot of interest in what is out there."
A poll out this week from USA Today and the Pew Research Center found that ObamaCare disapproval has reached at high of 53 percent.
The same survey found that nearly four in 10 of the uninsured do not realize they will be required to carry health coverage starting next year.
Filipic's comments came on a call with reporters about specific outreach efforts targeting uninsured Hispanics, a key community for the new insurance exchanges.
Activists said they are preparing for the open enrollment period by targeting certain demographics, such as mothers and businesses owners, that will influence others to sign up for coverage.
Outreach efforts have included text-message campaigns and on-the-ground events involving Enroll America's partners, such as the Service Employees International Union (SEIU), officials said.
SEIU International Secretary-Treasury Eliseo Medina noted that October is Hispanic Heritage Month, calling it an opportunity to step up the campaigns.
ObamaCare could be "life-changer" for Hispanics, but only if they understand the law, Medina told reporters.
"We are confident that when they hear the facts, they will sign up, and we will have a healthier community and workforce that will be good for all of us," he said.