I don't know if this poll is a repeat or not. If so, I'm sorry.
There's no need to apologize or wonder about it because that's one of the easier searches, and a good place for you to begin using the feature, since polls are archived in the same place.
Open the Polls Archive board, which you can find inside the Current Talk Archive, and enter your key words into the Search box at the top of the topics list; this will search for results only in that board.
Or, you can get the same results from an advanced search-- which is a link that comes up when you click the Search button in the menu on any page-- by entering your key words and checking only the Polls Archive box. Again, that will search for results that are only in the PA board. I hope that helped you with your next poll!