Paul's son, Kentucky Sen. Rand Paul -- who also addressed the crowd at Catholic University on Wednesday night -- urged those assembled to email Reid's office and plead with him to call a vote on the legislation.
The lawmaker said his staff uncovered video showing Reid in the 1990s "going to town, talking about how we should audit the Fed."
"Now, you have to convince him that he still believes that," Rand Paul said. "And so one of the things you can do, if everyone in this room left here and emailed Harry Reid, I think it would help."
Ron Paul predicted that the Senate would pass the legislation if actually brought to a vote.