Interestingly, it is paid for by the Georgia Republican Party.
UPDATE: Several people have asked for an explanation of the disclaimer. First, it has nothing to do with McCain-Feingold, which only applies to federal races.
The Georgia Code requires that parties can only spend $5000.00 on a candidate running for statewide office. However, if the ad mentions more than one candidate running for statewide office, it becomes a multicandidate expenditure and the GAGOP can spend as much as it wants. Mike Wiggins is a nonpartisan candidate, so it is questionable whether the GAGOP can run an ad for him under the multicandidate rule. But, by mentioning Stan Wise and Chuck Eaton in the disclaimer, the ad is a lawful multicandidate campaign commercial and the GAGOP can spend an unlimited amount in it — even though the ad never mentions the two Republican candidates, except at the end.