Adding to the mix, I'd push:
"Voting for Biden is really voting for a Harris/Pelosi administration. It's called 'Bait and Switch'.
The Presidency is a pressure-cooker environment and you want to put an addled 78-year-old man in there?
Pelosi dusted off the 25th Amendment (incapacitated President) not to use against President Trump, but to lever out Biden.
That means Harris becomes President and Pelosi becomes VP.
Do you hate President Trump THAT much that you would put America's future into the hands of those two?"
Not true! Harris would become President, but Pelosi, or whomever the Speaker of the House is, becomes merely next in line until the President nominates and the Senate approves a new Vice President. Go back to 1973 when Agnew resigned and Gerald Ford became VP. Also in 1974 when Nixon resigned, Ford became President, and Nelson Rockefeller was nominated to and became VP.
It's all spelled out in the 25th Amendment.