CNN explores the possibility of midterm e-vote hacks in the following video clips. In one clip, investigators demonstrate that a single hacker could use a virus to infect large numbers of electronic voting machines.
The Center for Information Technology Policy at Princeton University has studied the security of one popular electronic voting machine produced by Diebold. The study, titled "Security Analysis of the Diebold AccuVote-TS Voting Machine", located serious security flaws "that undermine the
accuracy and credibility of the vote counts".
The Center for Information Technology Policy's website contains the full report, as well as a comprehensive video demonstration a Diebold Accuvote-TS voting machine hack.