The hacking was serious and sustained and saw a significant amount of information downloaded from the campaign network, which the security agencies believed was sought by a foreign entity seeking to know more about the contenders' policy positions.
Details of the incident were revealed by a Newsweek reporting team that enjoyed behind- the-scenes access to both campaigns on condition that nothing was published until after polling day.
Federal Bureau of Investigation and Secret Service agents informed the Obama team of the cyberattack this summer. The McCain campaign was also similarly attacked.
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