Just a couple of days ago, I committed an important usability fix, making it much more convenient for returning members to check upon their past polling activity. Below each poll, there used to be a plain ballot, with either some default values filled in or with the voter's previous vote filled in.
One great feature of this site is that polls are usually not fixed, and new polling options can be added by members at any time. Thus, if a member has a better idea than anything that is currently proposed , she can add it straight away, and let the other members vote accordingly.