I think all these polls should be tossed out and replaced with new ones. The problem is that we don't have enough options. We only have 5 options when really, we should have 10 options (i.e., 10 stars).
If I want to vote in between, I cannot. Not all these options fit. A middle option would fit better in a lot of cases. So instead of 5 stars, let's move to 10 stars. It's easy enough to create new polls with 10 stars instead of 5. Granted, it would mean starting over, but it would also mean a lot more accurate results.
What could be done is new threads created and then the moderators can merge the old thread in the new thread without the original first post and then delete the original threads. That would work very well and once done, we'd be all set.