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https://media.cnn.com/api/v1/images/stellar/prod/ats-2104.jpg?c=16x9&q=w_800,c_fillFormer President Barack Obama plans to commence a 27-day campaign sprint for Vice President Kamala Harris next week in Pennsylvania, an adviser to the Democratic presidential nominee’s campaign said, hoping his star power among Democrats can help propel her to the office he once held.