I like the idea about having the lunch ladies, and the hall monitors and janitors, and especially the gymn teacher trying to vote though. You could say that only students of the school could vote (all the studens could get laminated ID cards, and the cards need to verified against the list of students). But then these other people could show up with little shreds of paper, with "Skrool ID" scrawled on it in crayon (like some kindergartner may do), or have the principle show up and have a realy nice card laminated card, but it says she's in second grade and is only 4 years old. Now point out that these people are what are called illegal aliens and have a right to vote (just like everybody else). Also, I'd just for poops and grins, make sure I slipped into the voting logs, some student names that don't even go to school there (nobody knows who they are), or have moved away. Point out that these are dead people voting. I'd also make sure that you poll some of the children about who they want to vote for, but promise them free chocolate milk at lunch-time if they vote for somebody else. You could point out that this is somthing else, you're not sure what, but its something.
Throw in: 1) special before-school voting for "subsidized breakfast" students, 2) Saturday voting, we'll send a bus to pick you up, 3) Varsity, Band , and Cheerleaders vote on Tuesday; Math Club, Science Club, and Chess Club vote on Wednesday, and the situation becomes really clear.
-PJ