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Political Campaigns Know Where You’ve Been. They’re Tracking Your Phone.

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When Donald Trump took the stage last month in Fayetteville, N.C., to support Republican candidate Dan Bishop in a special election, thousands of people showed up.

Mr. Bishop was seeking their support. An outside Republican group was looking for something more. It wanted their data.

Unknown to the crowd, the Committee to Defend the President,…

Source: WSJ.com: WSJD