In South Carolina you can vote in the Dem primary. I think I might vote for him.
If for some reason he beats President Trump we can go ahead and start preparing to Impeach Biden. We already have how to from the Dems.
If Biden were elected POTUS, the DEMs would also retain the House and take the Senate, making any impeachment talk pointless.
I think that is Hillary's plan all along. Get Biden to pick her as his VP, then, if he wins, dispose of him in any way possible.