You could do this:
Code:
ALTER TABLE poll ADD COLUMN pollid INT UNSIGNED NOT NULL AUTO_INCREMENT FIRST, ADD PRIMARY KEY(pollid)
But, this will assign a pollid to each record, and I have no idea if they'll be the same as they originally were. And if they aren't, things are likely to be messed up. But I don't really see that it matters - at worst you can remove the column again and be back where you are now.