The "undecideds" have always determined who wins the election. UN-DECIDED.
The fact that you and many others choose to INSULT them because they can't "immediately see" that Biden, even if he appears troublingly in need of at-home care, is a better choice than Trump, shows how entrenched you are in "being right" over "winning."
How do you convince a person who has yet to reject Trump based on what they've heard and seen, yet isn't sure whether they'll pick him or Biden, to choose Biden in the voting booth?