Manlove's office received three complaints, all from Democrats, about the volume of the mini-rallies in Kent County.
In Delaware, it's against the law to electioneer within 50 feet of a polling place. The rallies were well outside the radius, Manlove said -- but their chants weren't.
"I called and asked them to stop," she said. An hour after she made the call, she hadn't heard any more complaints, she said.
A spokeswoman for the Delaware Democratic Party, which publicized the complaints in an email, said they had received complaints of voters having trouble getting through the rallies and into polling locations.
The O'Donnell campaign did not return a request for comment.