Ms. Jennings, who is from Tulsa, Okla., and has described herself as a Christian pastor and counselor, has fast become a leading voice in the election-denial movement. She first proposed sending observers to ballot boxes this spring, just weeks after joining Truth Social.
“I have an idea,” she wrote on April 19. “In those states where they do not outlaw drop boxes, I think we have no less than 10 patriots standing around every one of those 24/7 for the duration of the voting period.”
In podcast interviews, Ms. Jennings said she was inspired by a trailer for the film, “2000 Mules,” released in May. The film, directed and produced by the right-wing pundit Dinesh D’Souza, relied heavily on debunked research from True the Vote, a group focused on voter fraud. The film asserts that “mules” paid by the Democratic Party ferried illegal votes to ballot boxes, often in the dead of night. It was shown in more than 400 theaters and brought in some $1.4 million at the box office.
Ms. Jennings’ ideas spread quickly as her posts were shared by election deniers with large numbers of followers, including Mr. Trump and his former attorney, Sidney Powell. Ms. Jennings launched a website in May and, this summer, frequently promoted her plans on right-wing podcasts. She urged people not only to gather around ballot boxes, but to photograph voters and reveal their identities online.
“I am FULLY STOKED that ballot trafficking mules are about to be completely doxxed and put on blast at every drop box across America VERY SOON,” Ms. Jennings posted on Truth Social on Sept. 8.
Ms. Jennings’s following on the platform has grown from barely 100 in April to more than 35,000.
Internal membership rolls show that roughly 4,500 people in 48 states have registered with Clean Elections USA, according to a report in Votebeat, a nonprofit news outlet. The group tells volunteers that the information they collect will be shared with True the Vote, which in turn works with Protect America Now, a group of sheriffs who have pledged to investigate election fraud, the report found.
It is unclear if Ms. Jennings has significant financial support. A fund-raiser she set up online in August had raised $3,600 as of Friday.