(CNN) - North Carolina Sen. Kay Hagan told reporters Friday a public health insurance option remains "on the table," as MoveOn.org announced an ad campaign targeting her over her reported lack of support for a public plan.
"Given recent comments showing that Senator Hagan is not supporting the public health insurance option, MoveOn.org will be making clear that our 115,000 members in North Carolina - many of whom volunteered for or donated to her campaign last year - believe the public option is the heart of true health care reform," the group said in a statement. "We'll run ads in North Carolina and D.C. asking that she advocate for the public option and support the President in truly solving the nation's health care crisis."
Earlier this week, Hagan told the Greensboro News & Record that a government plan could pose a major threat to private insurance companies.
The Democratic senator, who serves on the Senate Health, Education, Labor & Pensions Committee, has said she supports a "backstop option" for uninsured Americans that did not necessarily involve a government-run program - and her lack of support could prove a major obstacle for proponents of the idea, as Congress continues to weigh a plan to overhaul the nation's health care system.
On Friday, as MoveOn was announcing its campaign, Hagan told North Carolina reporters to "stay tuned" to the health care debate.
"We haven't taken a 'public option' off the table," she said, according to the Raleigh News & Observer - and those unhappy with her position "need to stay tuned."
"People are so centered on the word 'public,'" she said, according to the paper. "And it really depends on what's (involved) in that."
Sen. Dianne Feinstein of California is also facing a targeted ad campaign from MoveOn over remarks that President Obama's health care agenda might not have enough congressional support to pass this year, and her skepticism over enacting a public option.