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Why GOP Sen. Ron Johnson's seat is the most endangered in the midterms
The Lead
Sen. Ron Johnson (R-WI) is considered to be one of the most vulnerable Republicans facing reelection this year. CNN's Manu Raju explains what he's up against in his fight to stay in the Senate.
02:46 - Source: CNN
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Why GOP Sen. Ron Johnson's seat is the most endangered in the midterms
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