Clint said:
Hey C&C - last minute change of heart. Where's the undo button?
There's an "undo vote" button at the top of the poll (next to the "you have already voted on this poll") which allows you to change your vote up until the Poll is locked. If you do change your vote make sure you save your new pick.
Double check your vote is registered. You should have a little asterisk next to your choice of team
Once the poll is locked there is no going back.