Poll Problems

There is a serious problem with democracy, folks! Let me tell you what I mean. I hope you have noticed my poll app, as it has caused me a lot of trouble. The expiration date of voting is here, and so no one else can vote, and  conclusion has been reached by me. Unfortunately, whenever I go to remove it from the layout and replace with new question it says something along the lines of 'You can't edit this poll because someone has already voted.' If you have any idea how to fix this please let me know by commenting.