What a mess. I don't know what the Democrats are thinking, or Biden's family.
I can only think he himself has a huge blind spot, and probably is not doing his best thinking. But others should have taken action.
I imagine it's too little too late though, and what is he thinking endorsing Harris of all people!? If his endorsement is to be effective at all it needs to be someone with a chance of getting votes. Endorsing Harris at best will divide Democrat voters when they need to be focused and united.
Even without the weird response to the assassination attempt, Trump was looking a little ahead, and I think his choice of VP has done him a lot of good. It cements the sense of him as the champion of the working class, pro-union, etc, and increases the perception, already established, of the Democrats as the urban, university elite, working mainly for the good of bankers.
If Harris has any smarts she will refuse to step forward.