FILE - In this Aug. 20, 2015 file photo, Republican presidential candidate, former Pennsylvania Sen. Rick Santorum speaks at the National Press Club in Washington. The two returning Republican presidential candidates are struggling to keep their own donors interested. A majority of 2012 donors to former Texas Gov. Rick Perry and former Pennsylvania Sen. Rick Santorum who’ve given this time have defected to other candidates. That’s according to an analysis by Crowdpac.com, a nonpartisan political research company.(AP Photo/Evan Vucci, File)
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