A few months ago there was something on the web (Facebook?) trying to get Washington Republicans out to vote. They said that in Washington State, something like 65% of registered Dems vote, while only 45% of Republicans vote. The thinking being that “Well, what’s the use, we can’t win anyway.”
Hearing about these machines, it wouldn’t surprise me if the actual vote isn’t more like 50/50, and the machines take care of that 20% difference.