If Trump was not currently president, Biden would be forced by Dem insiders to drop out. There is zero chance the Dems would run him against Kasich or Jeb Bush.
But since Trump is his competition (and has an even worse track record), Biden will get a pass.
This is the problem with the "I support Trump's policies, but not who he is as a person" argument. The result is the standards of who gets to hold our nation's highest office have forever been downgraded.
I personally think Joe should drop out. That said, I'll probably end up voting for him in November only b/c he's not as bad as Trump.