Hello.
For the first time I started a poll into my site and the first thing I noticed is that each member can add several votes, so the poll results are not true at all. Adding polls is not an important feature, but if it is provided then it's better to make it works right and to prevent affected results.

Request: each member has to be allowed to vote just one time for each poll. If a member votes again, his previous answer has to be deleted and not counted (so he may change his opinion or correct an error, but he can put just one answer per poll). I suppose this can be done only excluding guests (because is impossible to prevent that a guest votes several times, even if using cookies or whatever else), but this is the only way to prevent distorted poll results.

P.S. Another good addition should be allowing admin to reset poll votes and the counter of total votes. This way the same poll can be used, then deactivated, then resetted and used again after some time.