I wrote for Politico about how the two recent mishandles of classified documents want and need one another politically:

Trump wants revenge against a president who humiliated him in 2020 and who, with an approval rating in the mid-40s, would seem ripe for the picking. Biden wants to run against a persistently unpopular, controversy-plagued former president whom he beat once before and used to great effect as a foil in the 2022 midterms.
Trump’s best argument is that his policies were better than Biden’s. Biden’s best argument is that he’s not Trump.
It’s the weirdest, and most dispiriting, symbiotic relationship in politics. It’s the career politician soaked in conventional politics versus the upstart developer with zero respect for rules. The establishmentarian versus the populist. Boring versus erratic. And . . . unpopular versus unpopular, as well as, now that you mention it, old versus old.