Yet another voting machine hacking video. (article, alternet)
The Computer Security Group at the University of California Santa Barbara (UCSB) has released a short, chilling video demonstrating how a single person can hack an election on a touch-screen voting system -- even one with a so-called "Voter Verifiable Paper Trail" (VVPAT) added to it -- in such a way that it is highly unlikely that the manipulation would ever be detected by either the public or election officials.
Direct link to videos (youtube) [Part 1] [Part 2]