The lobbyist, Tom Norris, is listed as the Government Integrity Fund’s chairman and treasurer. Norris owns an Ohio lobbying firm, Cap Square Solutions, and last year hired a top Mandel aide, Joel Riter, to work at the firm.

Riter’s role in the Government Integrity Fund, if any, is not clear. The former Mandel aide declined to say whether he is involved with the group that is chaired by his current boss and running ads in support of his former boss.

“I can’t talk to you about this,” he told ProPublica. “I’m not going to comment on any kind of involvement I have with anyone.”

Norris did not respond to requests for comment, nor did the Mandel campaign.

The documents identifying Norris as the chairman of the Fund are public because of a Federal Communications Commission rule requiring TV stations to keep detailed records about political advertisers. The files can be valuable, offering a look at exactly who is spending and how much. Until recently, the documents were only available by physically traveling to stations. ProPublica’s Free the Files project has spotlighted the issue and this summer the FCC passed a rule requiring the stations in the nation’s top markets to upload the files to a government website.

The documents were filed with a Cincinnati NBC affiliate, WLWT, one of the stations the group has been advertising on. Here is a Fund ad that attacks Senator Brown for purportedly turning his back on his younger, more honorable self. “Young Sherrod Brown was independent of Wall Street,” the announcer says. “Today Sherrod Brown takes big money from those same corporate interests.”

The Associated Press reported last month that outside groups have spent $15 million supporting Mandel compared to about $3 million on the Democratic side.

We still don’t know who is putting up the money for the Government Integrity Fund’s ads because the group is a non-profit “social welfare” group, which don’t have to release donor information or register with the Federal Election Commission. Such groups are supposed to be “primarily” engaged in promoting social welfare but they have been flooding the airwaves with political ads in the wake of the Supreme Court’s Citizens United case and decisions by regulatory decisions.

Besides identifying Norris as the chairman of the group, the form filed with the TV station shows that the Government Integrity Fund has an office at 208 East State Street, a few blocks from the state house in Columbus. Riter, the former Mandel aide, also has an office in the building.

Asked about his office at 208 East State Street, Riter said: “Whatever office Government Integrity Fund has is not mine.”

Outside groups are not allowed to coordinate with campaigns, but it is common for politicians’ former aides to be involved with such groups.

Riter first worked as an aide to Mandel during the candidate’s stint in the Ohio legislature. Riter then became field director for Mandel’s campaign for state treasurer, joining the treasurer’s office as constituent and executive agency liaison after Mandel won the race. Riter left his state job in the treasurer’s office after six months to become a lobbyist at Cap Square in 2011. According to state records, the firm lobbies for a range of interests, including the Ohio Ready Mixed Concrete Association and medical device companies.