"So between October 3, 2011 and the beginning of April, she was his campaign manager. But she was getting paid by a PAC," said Appleton attorney Ron Tusler, an official with the Outagamie County Republican Party, but who filed the FEC complaint on his own.

Those allegations were first raised on the conservative website "Mediawatchers-dot-com." It was based on campaign reports that show an October 2011 contribution listing Zellner as campaign manager. That was the same time she was with the Service Employees International Union Political action committee.

But Wall's campaign countered with a pay statement showing she served as campaign manager in early April 2012. Wall says when Zellner's occupation changed, computers changed all records to reflect that.

"There's only one record per person. That changed her occupation then. If you look at the original version of that report that was filed, she's not listed as my campaign manager, because she wasn't," said Wall, Democratic challenger to 8th District Representative Reid Ribble.

Wall and Tusler agree that accountability is needed here.

"If it decides to investigate, I think that will be a sign that it looks like there's something wrong here," Tusler said.

"I'd like to be talking about the issues that matter to real people instead of all this personal mud slinging when there's not an ounce of evidence for any of it," said Wall.

The FEC will ultimately decide whether there is sufficient evidence to warrant an investigation.