Still Undecided?

I saw a news item today to the effect that there is still a sizable number of undecided voter's for Tuesday's upcoming election. What's up with that? They've been subjected to months of campaign ads, endless newspaper and magazine articles, countless radio and TV shows and commentaries, God knows how many discussions on the Internet and it's only 5 days away and they STILL don't know? What? Are they hoping Hillary Clinton will enter the race at the last moment and save us all?