Several Detroit-area business executives who support U.S. Senate candidate Clark Durant over Republican rival Pete Hoekstra are funding anti-Hoekstra ads through an independent political action committee.
Prosperity for Michigan has spent $275,000 to run television ads in Michigan in the final weeks before the Aug. 7 primary election.
The ads criticize Hoekstra for voting for earmarks and raising the federal debt ceiling while he was in Congress through 2010. Durant makes similar charges in his own campaign ads.
Prosperity for Michigan didn't reveal its donors or spending until filing an amended campaign finance report Monday, a week after the filing deadline.
Hoekstra, Durant and Randy Hekman are competing in the GOP primary for the chance to take on Democratic incumbent Debbie Stabenow in November.