Wisconsin has the fourth most expensive U.S. Senate race in the country, according to AdImpact.
Between Jan. 1 and Wednesday afternoon, more than $177.3 million had been spent on broadcast, cable TV, radio, digital and satellite, according to the tracking service.
Pennsylvania had the most expensive race over that period at $250.4 million, followed by Georgia ($239.9 million) and Arizona ($189.3 m...
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