Cyber War

Oop! Sorry; I didn’t read it clearly.

It’s already happened:

Titan Rain

Cyberattacks on Estonia, 2007

The hacking of both McCain and Obama’s staffing offices by an unnamed nation was pretty big news. The hacking nation apparently wanted to see potential policies that might be put into place.
Link

Shortly after Obama won, I read in a Japanese news article that politicians there were very interested in learning the methods that he had used to raise so much money and to get his message out so far. It said that several Japanese people had volunteered to work in his staff and were now back in Japan holding classes.

Assuming other nations did the same thing (with both Obama and McCain’s camps), it’s possible that any such attack came as a result of having foreign nationals physically inside the campaigns. But on the other hand, this could mean simply that they were trying to learn how to campaign 21st Century style and nothing particularly nefarious was intended.