It’s the most expensive race for a Minneapolis City Council seat this year, maybe ever, and it could tip the balance of power in City Hall: the Ward 7 contest between incumbent Katie Cashman and challenger Elizabeth Shaffer.
Cashman, a first-term incumbent, lost the DFL endorsement in May to Shaffer, a member of the Park and Recreation Board, and Shaffer has more than doubled Cashman’s fundraising efforts in a ward that includes some of the city’s wealthiest enclaves…