Computer networks of both presidential hopefuls campaigns were infected with trojan of an undisclosed nature. Trojans were later used to siphon an unknown number of files from both networks. Whoever did it gained unique insight in the motivations and agendas of both candidates, as well as a good perspective on their respective strategies, both pre- and post-election. The fact that Obamas campaign staff detected the intrusion on their own remains to be commended, but it is an awkward situation for defenders.”]
Source: https://www.bitdefender.com/blog/hotforsecurity/obama-mccain-campaign-servers-hacked/