Its an interesting one isn't it. Its quite possible to be an undecided voter with strong political leanings, but for whatever reason, be it unhappiness with the leader, or a particular mp or whatever, puts you in the undecided category.
If one is being truly accurate, everyone is undecided up to the point where they place their vote, as there is always the possibility (no matter how remote) that they could change their minds.
That aside, how does one vet an entire audience to ensure their views are what the say they are. Tricky
