The Fukin Prophecy
RIP Champ
There is a really good documentary on this on prime...i've read articles that suggest they can be hacked anyway
Experts find more than 30 U.S. voting systems connected to internet
Which voting machines can be hacked through the Internet?
They are susceptible to being hacked, a dude bought like 3 out of commission olver voting machine models and took them to black hat expo in Vegas (massive hacker convention) and they were able to hack the shyt out of them but that was through wifi...
I forget the name of the doc but it was excellent...
So yea it is possible, but they did confirm the machines are not supposed to have internet connections...