This is a "Hillary and those emails" attack but it was too soon. It'll feed into the general narrative of Biden's faculties but it's not going to convince any never-Trumper to switch their vote.
"Wow, Biden has a poor memory, per this investigation. I'm now going to vote for the other old guy, who also has a poor memory, and who tried to overthrow the 2020 election!"
Stalwart Trumpers will be bringing this up in their echo chambers until November and beyond (Fox News: Unemployment numbers are still low...but Biden may not know that!). It's not going to noticeably move the needle.
Very true. None of this day-to-day political gotcha is going to move the needle for either candidate.
It's easy to forget that there's a sizeable divide between the people who are really into politics and those that aren't. People who follow politics closely already have their minds made up.
A sizeable portion of the population goes on with their daily lives without caring much. They go to work, take care of their families, and avoid the daily political outrage. They don't know or care about whatever Trump or Biden said last week, and don't know/care about what's going on in Trump's trials.
This will probably change a bit as we get closer to the elections. People that normally don't pay much attention might watch a debate or try to get a sense of how the candidates are handling an issue they care about. This is when persuadable people will make up their minds. Not just of who to vote for, but
whether to vote. Elections aren't decided by how many people support one candidate or another. They're decided by who shows up on election day.
Absent major changes, Biden has an advantage here. Sure, he's not an inspiring figure that's going to get people excited. But he has the advantages of incumbency, and he's broadly acceptable to voters from the left and moderates.
Almost the entirety of Trump's next year is going to be spent in a courtroom. He's being tried for 91 felony counts in multiple trials and districts. Criminal trials aren't like the civil trials he's been in so far. His butt is going to be in a seat in the courtroom. Not campaigning. Not giving speeches. Maybe he'll be able to show up to a debate specifically arranged around his court schedule. Maybe not. He'll probably manage to talk himself into contempt-of-court at least once. I also believe that he is psychologically incapable of separating his campaign from his personal grievances. It's not going to be a campaign dominated by "building a wall Mexico will pay for" or "lock her up". It's going to be a campaign against various DA's prosecuting Trump. I don't know how many people this will convince to show up for Trump, but I don't think it's a recipe for driving Republican turnout, or convincing moderates to show up for him.