It shows he's not the pick of the party or the upper level people in the party would have worked something out.
Don't forget, the Senate will be a much different setting. They can call whoever they want for whatever reason. The rally cry will be you got our guy, we'll get yours. Biden won't hold up to it as well as Trump as. You can tell in recent t.v. spots that it's starting to bother Uncle Joe and in fact, he's wanting to ignore it all together.
The Senate hearing will be a blood bath for the democrats.