Perhaps I’m naive, but how could anybody be “undecided” at this point? These are by far the two most well known candidates in history.
Now perhaps GOTV work would be useful, but trying to sway opinion at this point seems like a joke.
The only change I believe is possible is toward supporting Trump. Because he is the candidate that someone might not like at first but he grows on you after awhile. It’s tough to resist his positive message for too long. Nobody would go toward HILLARY. Just no one.