I'd been saying this for a while but I had never found the actual testimony to back up my claim. Here it is:

http://video.google.com/videoplay?do...+exposed&hl=en

I remember reading an article where a spokesperson from Diebold admitted this was possible, but claimed it would require "evil or nefarious elections officials" to meddle with the results and he didn't believe such evil or nefarious people existed.