Hill Holliday Chief Executive Officer Mike Sheehan has been named an unindicted co-conspirator in the case against former state treasurer Tim Cahill and Cahill’s former campaign manager Scott Campbell, a prosecutor said in court on Monday. Campbell and Cahill are accused of conspiring to use Cahill’s office for an unwarranted privilege: running ads for the Massachusetts State Lottery, allegedly to boost Cahill’s electoral hopes during his 2010 run for governor. Hill Holliday was the Lottery’s longtime ad agency.
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