you vote for me or you made a mistake, which "the system" will correct for you
Didn't that happen on the last US election? There were some reports (rumors?) of users trying to select one candidate or the other and it selected the opposition and there was no method of correction (e.g., you voted for Kerry and the vote ended up for Bush and vice versa). (see this AO Thread). The screen was made far too senstive, IMO, and the slightest movement caused the machine to vote for the user (I've run into a similar instance with my stupid laptop's touch pad when typing responses -- if I run my hand too close to it, it moves the cursor location).