Every election, people from out of state say, "AH!!! Diebold machines, must be corrupt!" And the sore losers demand a recount. I've participated in many of the recounts since 2004 at the legistlative office building Concord. Firstly, the machines we use in NH are not the push button types that are controversial. Here in NH, you get a ballot with those little circles in it that you mark with a pen, and the machine reads the marks. Ballots are kept for recount purposes. In my recount experiences, no election has changed its outcome by more than 35 votes, and typically thats because lazy morons were very sloppy in how they filled out their ballots, or marked multiple candidates. We go through every ballot, with a rep from each side of a race sitting in front of a ballot official who holds up each ballot, states what he reads it as, and you can challenge it or not. All the challenged ballots wind up getting agreed on by the secretary of state and a rep from each party as to what they mean.
The poor machines are doing the best they can, but you put a garbage ballot in, you get a garbage vote out.