FILE - In this June 29, 2010 file photo, Microsoft founder Bill Gates, left, shakes hands with Nelson Smith, who at the time was President and CEO of the National Alliance for Public Charter Schools, during the National Charter Schools Conference in Chicago. All told, the Bill and Melinda Gates Foundation has given about $25 million to the Washington State Charter Schools Association, and since 2006, philanthropists and their private foundations and charities have given almost half a billion dollars to similar groups, according to an Associated Press analysis of tax filings and Foundation Center data. (AP Photo/Kiichiro Sato, file)
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