Bill Clinton’s aides revealed concern early in his presidency about the health care overhaul effort led by his wife, Hillary Rodham Clinton, and later about what they saw as a need to soften her image, according to documents released Friday. Hillary Clinton now is a potential 2016 presidential contender

The National Archives released about 4,000 pages of previously confidential documents involving the former president’s administration, providing a glimpse into the ultimately unsuccessful struggles of his health care task force, led by the first lady, and other Clinton priorities such as the U.S. economy and a major trade agreement.

Hillary Clinton’s potential White House campaign has increased interest in Clinton Presidential Library documents from her husband’s administration during the 1990s and her own decades in public service. A former secretary of state and New York senator, she is the leading Democratic contender to succeed President Barack Obama, though she has not said whether she will run.

Friday’s documents included memos related to the former president’s ill-fated health care reform proposal in 1993 and 1994, a plan that failed to win support in Congress and turned into a rallying cry for Republicans in the 1994 midterm elections. As first lady, Hillary Clinton chaired her husband’s health care task force, largely meeting in secret to develop a plan to provide universal health insurance coverage.

White House aides expressed initial optimism about her ability to help craft and enact a major overhaul of U.S. health care.

“The first lady’s months of meetings with the Congress has produced a significant amount of trust and confidence by the members in her ability to help produce a viable health reform legislative product with the president,” said an undated and unsigned document, which was cataloged with others from April 1993. The document urged quick action, warning that enthusiasm for health reform “will fade over time.”

But the documents also showed the growing concerns among Clinton’s fellow Democrats in Congress. Lawmakers, it said, “going to their home districts for the August break are petrified about having difficult health care reform issues/questions thrown at them.”

Administration officials also wanted to distance Hillary Clinton from a staff meeting on the touchy subject of making health care cost projections appear reasonable. Top aides wrote an April 1993 memo saying pessimistic cost-savings projections from the nonpartisan Congressional Budget Office were “petrifying an already scared Congress.”

By September 1993, Hillary Clinton acknowledged the obstacles in a Capitol Hill meeting with House and Senate Democratic leaders and committee chairs. “I think that, unfortunately, in the glare of the public political process, we may not have as much time as we need for that kind of thoughtful reflection and research,” the first lady said, citing “this period of challenge.”

The meetings also showed that Hillary Clinton was doubtful that a health care law with a universal mandate — requiring people to carry health insurance — would be approved. “That is politically and substantively a much harder sell than the one we’ve got — a much harder sell,” she told congressional Democrats in September 1993, predicting it could send “shock waves” through the “currently insured population.”

In 2007, when she ran for president, Clinton made the “individual mandate” a centerpiece of her “American Health Choices Plan,” requiring health coverage while offering federal subsidies to help reduce the cost to purchasers.