I think you're talking yourself into something that you probably don't actually believe.
There's a reason incumbents usually win. I would be especially bearish about a Dem challenger who struggled to beat a socialist beating an incumbent president who is presiding over an economy like this, regardless if said president had much to do with this economy.
You know all these things. You know how terrible Biden has looked throughout. You know his campaign is running on fumes financially.
But keep telling yourself he's going to wallop Trump in the general election that will probably never happen, if that makes you feel better.