That promise is probably not worth wasting much time in discussion.
I don't know what the religious make up of the undecided is, so I decided to look it up, and according to the RNS,
"A whopping 22 percent of Protestant pastors haven’t settled on a presidential candidate, according to a survey released earlier this month by LifeWay Research. By comparison, just 4 percent of all likely voters remain undecided, according to Gallup."I hope they are undecided because perhaps they are more likely to put their trust in God, and the rest of us are more likely to chase after idols, but the article points to the possibility that some pastors are just trying to avoid conflict.
I don't know what you think your guy will do for you over the next four years, but when you go to vote this Tuesday, whether you are undecided or not, please keep in mind this one basic thing:
God: Change you CAN believe in.
Then the scribe said to him, ‘You are right, Teacher; you have truly said that “he is one, and besides him there is no other”; and “to love him with all the heart, and with all the understanding, and with all the strength”, and “to love one’s neighbour as oneself”,—this is much more important than all whole burnt-offerings and sacrifices.’ Mark 12:32-33Now, that is a vote that will not be wasted.