Lt. Gov. Mandela Barnes of Wisconsin is entering Tuesday’s Democratic primary for a Senate seat as the clear favorite to take on Senator Ron Johnson and is already sharpening his attacks against the Republican incumbent.
In ads and speeches, Mr. Barnes has started hitting Mr. Johnson on what he calls a pattern of hurting the state’s manufacturing industry and failing workers. As he aims to make the race a referendum on Mr. Johnson, Mr. Barnes has his own vulnerabilities, and Republicans are certain to try to portray him as too left wing for Wisconsin.
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