WASHINGTON— Protecting the privacy of law-abiding citizens from the government is a pillar of Ted Cruz’s Republican presidential candidacy, but his campaign is testing the limits of siphoning personal data from supporters.
His “Cruz Crew” mobile app is designed to gather detailed information from its users’ phones — tracking their physical movements and mining the names and contact information for friends who might want nothing to do with his campaign.
That information and more is then fed into a vast database containing details about nearly every adult in the United States to build psychological profiles that target individual voters with uncanny accuracy.
Cruz’s sophisticated analytics operation was heralded as key to his victory in Iowa earlier this month — the first proof, his campaign said, that the system has the potential to power him to the nomination.






