I'm thinking of telling them it stops being harm reduction when both candidates threaten to arrest my anarchist comrades
Lots of these volunteers are just schlub liberals who got sucked into textbanking by their overenthusiastic friends, because they were sick of letting reality steamroll them into the asphalt and just wanted to do something.
You absolutely can radicalize them. Not, like, over a single text conversation. But you can absolutely raise Biden's contradictory statements on GND or remind people about his role in the Anita Hill hearings or note how he was part of the '06 Gang of Eight that gave up on a bunch of Bush judicial nominees in order to protect the filibuster. Plenty of low-hanging fruit with Biden. Hell, "Biden opposed universal health care, then went to Obama to pay for his son's brain surgery. I'm not friends with Obama. How can I rely on that kind of guy when I'm faced with a medical emergency?"
That shit shocked me, and I'm already down the lefty hole.
You don't need to give them your data. They don't care, you're just another number on a spreadsheet to them.
Tell them you think Biden's more likely to start another war than Trump.
I suggest copypastas or continously flipflopping from neoliberal-centrist to Maoist talking points to make it more fun