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"MVP" of Trump's 2016 Facebook campaign now working against him

A former Facebook employee once hailed as an "MVP" of the Trump campaign is now working against the president. A member of Facebook's ad sales team in 2016, James Barnes is now working with a liberal group to prevent Mr. Trump from winning a second term. The Wall Street Journal's Deepa Seetharaman spoke to Barnes and she joined CBSN with the details.
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