From the source, And so electronic voting machines fell from favor. Just 25 percent of the country will use paperless systems this year—down from 40 percent in 2006.

I read that as a quarter of the country will be using paperless systems in this election. If that is wrong, please explain the correction.

Grabbing another source, http://www.computerworld.com/s/article/9233058/Election_watc... lists specific states where paperless systems are likely to be a big issue. Two of them, Virginia and Pennsylvania, are significant swing states that currently lean towards Obama in polls. If both have an unexpected swing to Romney, his chances of legitimately winning enough other states to carry the election are significantly increased. (According to what I see on http://www.electoral-vote.com/ he'd need to carry North Carolina and Florida - both of which he's at least tied in, and then any other swing state.)

Hopefully unaccountable election machines won't prove to be the margin of victory in this election. However anyone who thinks it is impossible is either uninformed, or unwilling to consider the evidence.