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Dell warns of data breach, 49 million customers allegedly affected
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
Ok, what information could they gather and how would they use that to influence an election?
The section Methods on the Cambridge Analytica wiki page explains it pretty well. While it's not proven to be able to directly influence voting, it's effective at swaying people's opinions and emotions about subjects.
So it's all bullshit then, got it.