“At this point we are forging ahead,” Levi Russell, a spokesman for the group, said on Friday.

Still, he acknowledged that there are red flags in her personal biography. “There are definitely a lot of questions,” he said, adding that they had “very little” contact with anyone on her campaign this year.

Aides who worked for Ms. O’Donnell’s 2008 campaign against then-Senator Joseph R. Biden Jr. claim that she withheld thousands of dollars in promised salary and never reimbursed them for out-of pocket expenses.