Problem is Trump has more racist hits. More than just his mouth. If that's the route you're taking, it'll mean people will just take a closer/another look at Trump's racist issues. Backfire.
Ah, you guys are nervous Biden is going to run, he said he might. This was Trump's first time, so everything was new. Biden has been in politics his whole life basically, the stuff you're posting is nothing new, was used against him in the past yet in a current poll for 2020 Presidential matchup:
Biden - 46%
Trump - 35%
"Independent voters tilt away from the incumbent: 41 percent would vote for Biden, and 26 percent for Trump."
https://www.politico.com/story/2017/11/15/biden-trump-2020-elections-244900
Trump will get wiped. He'll see polls like this and won't even run, fold.