Continuing to get déjà vu here
The pitch of "Biden is a decent person and Trump is an awful man!" will work about as well as "Hillary is a decent person and Trump is an awful man!".
Two differences:
1. In 2016, Trump was only a potentially awful President. Now he has a record as a demonstrably awful President.
2. Hillary was smeared enough to come across as "not decent" to many people. Although Trump will certainly try the same tactics with Biden, I don't think it will be as successful against him.
1. If the economy hasn't completely been tanked by the coronavirus in November (it'll be a tough summer but the world will hopefully pull through) then that won't matter to a lot of voting independents and moderate Republicans, who really only experienced the horrors of Trump's presidency on an aesthetic level.
2. Biden will absolutely be painted as mentally unfit and unprepared by Trump's campaign. Hannity is already doing it. If we get to the debate stage and Biden is still making verbal gaffes and trying to get out of talking for too long then it's going to be one hell of a contrast against Trump who evidently had a fairly good stage presence in the 2016 debates.
