Maybe PE could create a QR code for voting
I don't know if it is possible but maybe PE could generate QR codes for voting. A student or person could scan the picture with their QR reader and that would cast a vote.
Web voting via QR code can currently be accomplished with a QR code generator in conjunction with our various voting links. (see comments)
I could see using a QR code to link to a Poll or web voting widget. It's worth mentioning this can already be done by using a poll's url in combination with a service like http://qrcode.kaywa.com/
Direct link to a poll
Direct link to web voting (notice appended /web)