A review of filings with federal regulators, court documents and media reports shows that a handful of the companies have been involved in several controversies.
Thompson, a former Republican governor, is running for the U.S. Senate in the November election.
"Either he has really bad luck choosing companies . . . or he is one of the directors on company boards who is not exercising sufficient oversight," said Paul Hodgson, chief research analyst at GMI Ratings, a rating agency that this year gave failing marks to three of the six public companies whose boards Thompson sits on.
Tommy Thompson's Troubles
The Journal Sentinel's Cary Spivak peruses the records and finds that businesses associated with GOP Senate candidate Tommy Thompson have had their share of troubles:
