It's got to be that they are counting people as *undecided* who are actually *refuse to declare*.
Bingo — if you are a Democrat not voting for Obama, no way do you want to declare to a pollster that would have your information. PUMAs have stated there are Obama supporters in all but a few polling companies and they have all been telling pollsters they are undecided or voting for Obama when they are voting for McCain.
Pretty bad when you are afraid to tell someone who you are voting for but I don’t blame them.