Elizabeth Edwards, wife of former presidential candidate John Edwards, remains unwilling to endorse either of the two remaining Democratic contenders, but the health care advocate told ABC News she preferred Sen. Clinton's health plan to Sen. Obama's.

In an interview with "Good Morning America's" Robin Roberts, airing Wednesday, Edwards — who recently began work as a senior fellow at the liberal think tank, the Center for American Progress — said she believed Clinton's health care plan was more inclusive than that of the Illinois senator.

"You need that universality in order to get the cost savings ... I just have more confidence in Sen. Clinton's policy than Sen. Obama's on this particular issue," she said.

Edwards, a vocal part of her husband's campaign, has been largely quiet since the former senator dropped out of the race three months ago. She stepped back into the fray, however, last weekend with an attack on Sen. John McCain's health care plan. She argued that neither she, who has breast cancer, nor McCain, R-Ariz., who had skin cancer in the past, could obtain health insurance under his health care proposal.