What do you want to do with polls?
Take a look at the Advanced Polls extension, and you may find what you are looking for. And if the functionality is not there, and is general enough, let me know, and I might include it...
In any case, you may take a look at the code to see where to get such information. It is in the event, for sure, but you have to be very careful: sometimes is in the topic data, and sometimes is in the poll data. It is quite a complex extension though I must say, and the code is not as clean as I would like it to be.
Note it is for 3.1 only at this point, due to the use of custom notifications. I will port it to 3.2, just don't know when (as I want to do a major rewrite of it as well). If you can live without poll notifications
, you can try the extension in 3.2, and should work just fine. Let me know, and I will tell you how to remove notifications for 3.2.