Requirements

1. Users can view a list of the available polls.
2. Users can view a previous submission.
3. Users can vote any time during the polling period.
4. Users can modify their choice any time during the polling period.
5. The poll can have unlimited number of survey items and number of responses.
6. The poll should have an automatic way to set a start and end date.
7. Users can't vote or modify an existing vote after the closing date.
8. Users can't view the poll question before the opening date.
9. Users can still view the poll question and results after the closing date.