Campaigns routinely vet prominent supporters through public records, typically computer searches using Internet search tools Google or Lexis-Nexis.
NPR: Clinton to Return Funds from Fundraiser Hsu
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In the 10 years Berry was missing, the Cleveland Plain Dealer newspaper published 36 articles about her, according to a search of electronic news archive Lexis-Nexis.
BBC: Magazine
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Our power rankings are based on a proprietary formula weighing salary, number of press clips returned on Lexis-Nexis, and by gauging popularity from searches on Dow Jones Interactive and Google.com.