Do not attempt this at home.
Princeton researchers show how to steal an election with Diebold machines Princeton security researchers Ariel J. Feldman, J. Alex Halderman, and Edward W. Felten have taken apart one of Diebold's notorious voting machines and done a thorough security analysis of its workings. They showed that they could easily install software on the machine that would allow an attacker to steal votes from one candidate and give them to another -- they showed that this would be undetectable, and easily done. They've published a paper and an amazing, disturbing video showing how this could be done.
Henny penny! The die(bold) is falling!
Video and links to PDF and other info found at http://itpolicy.princeton.edu/voting/