Just in case you haven't seen this. This is an actual ballot in the Washington election. If you look very closely, just to the left of the names, you can make out the bubbles which a voter would fill in to cast a vote. As you can see, none of the bubbles have even the slightest mark in them. In the margin of the paper you can see the holes for the card reader, and on one of those holes there is a vague pen mark, of the sort one might make if one was scribbling on a piece of paper, and this paper happened to be underneath it, and slighting jutting out. However it got there, there is no way that this is a vote for anybody. This was counted as a vote for Gregoire.
(Click on the picture for more details)