Mequon - Voters overwhelmingly rejected a referendum Tuesday that would have raised taxes in the Mequon-Thiensville School District by $2.5 million for each of the next three years. Fifty-seven percent of those who cast votes opposed the measure, which sparked one of the highest turnouts - 37% - among Tuesday's primaries in the metro area,3 according to unofficial results. Officials had said the referendum was necessary to offset a $6.5 million budget shortfall the district faces in the next three years. It would also have funded $1 million in technology upgrades and maintenance repairs. "It's a simple yes or no...