Political groups are now using the phones in the pockets of Americans to track their past locations. Patience Haggin, who covers digital advertising for the Wall Street Journal, spoke to CBSN's "Red & Blue" about the new phenomenon.
Report: Political campaigns tracking Americans' location through cellphones
Political groups are now using the phones in the pockets of Americans to track their past locations. Patience Haggin, who covers digital advertising for the Wall Street Journal, spoke to CBSN's "Red & Blue" about the new phenomenon.
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