Sen. Rand Paul, R-Ky., holds up his cell phone as he speaks before announcing the start of his presidential campaign, in Louisville, Ky., in this April 7, 2015, file photo. (AP Photo/Carolyn Kaster, File)
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Sen. Rand Paul, R-Ky., holds up his cell phone as he speaks before announcing the start of his presidential campaign, in Louisville, Ky., in this April 7, 2015, file photo. (AP Photo/Carolyn Kaster, File)
