Like I been predicting since last year, Biden has successfully played his part as a meat shield absorbing immense amounts of criticism towards the Democrats. Kamala was essentially hiding and doing very little as VP, so she came into the race with fresh legs. It's like switching a boxer's opponent halfway through a fight. The Dems will pull as many dirty tricks and cheats as possible to win.
You're forgetting the main criticism towards them: their radical record. That's why the MSM has been working overtime spinning or sweeping their radical beliefs under the rug. This will catch up to them eventually.