Fieger said subpoenas left by the agents said they were looking into campaign contributions his staff made to 2004 Democratic presidential candidate John Kerry and his running mate, John Edwards.

According to the search warrant return:

Agents were looking for payroll and tax records and documents relating to candidates for elected office, according to a return of the executed search warrant filed in federal court in Detroit.

According to the Times, this is not the same investigation as one that concluded a few months ago:

The investigation is separate from and predates Michigan Attorney General Mike Cox's investigation into whether Fieger illegally funded a $457,000 ad campaign against state Supreme Court Justice Stephen Markman in last year's election, she said.

Cox called a news conference Nov. 9 to acknowledge having an extramarital affair years ago. He accused a Fieger associate of threatening to expose the indiscretion unless he stopped the campaign finance investigation. The Oakland County sheriff's office investigated Cox's allegations against Fieger, but prosecutor David Gorcyca said Nov. 15 that he did not have sufficient evidence to prove extortion.

Update: It looks like the Public Integrity Section is leading the investigation. They may want to determine whether Feiger had his employees contribute to John Edwards' presidential campaign to get around the $2,000. limit and then reimbursed them.

Personally, I think Fieiger is too smart for that. I also wonder if a disgruntled employee didn't call the feds. The AP reports:

In the search of Fieger's offices in Southfield, outside Detroit, agents targeted the law firm's senior bookkeeper and office manager and two employees who work with her, according to a return of the executed warrant filed in U.S. District Court in Detroit. They were looking for employment and compensation records; canceled checks and bank statements "indicating the manner in which the law firm calculated, recorded, and treated the payment of reimbursements or compensation to its employees"; documents relating to Paychex Inc., a payroll services firm; tax records; and documents relating to candidates for federal, state or local office.

Among the 39 seized items listed in the inventory were payroll binders and personnel files, as well as Edwards for President ticket stubs and a Fieger for Gov. folder. Fieger mounted an unsuccessful challenge to Gov. John Engler in 1998.