Sen. Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, in Washington, D.C., on Wednesday. Bloomberg via Getty Images hide caption

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With permission, the Cruz campaign's app searches for potential supporters within users' phones Scott Detrow/NPR hide caption

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Cruz's Crew: You Play The Game, But It's The Cruz Campaign That Scores

Ted Cruz's campaign is hoping its app motivates supporters to volunteer and donate as well as turn over personal information.

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