“Nine percent of registered voters said they were undecided”
Nine percent undecided seems like a substantial number. Could the majority of these undecideds be those Trump voters who won’t reveal their support for him over the phone? It seems logical they would simply say they’re undecided. If True, Trump could actually be substantially ahead in this poll.
I believe the “silent” Trump voter is not only real but their numbers have increased substantially since 2016.