The more they keep Biden out of the spot light, the better his numbers get.
An ironic thing about Biden is that although he was veep for 8 years, Obama kept him quarantined the last 4-5 years of Obama's Presidency more rigorously than Covid has. They recognized his "open mouth, insert foot" tendencies early on.
I think that to people who don't follow politics, Biden looks like a safe choice; a kindly looking, well groomed, old white guy, that they recognize from his years as VP. Best of all he isn't Trump who, as the MSM has told them over and over, is a Nazi devil worshiper, that is trying to take their health care away.
If you vote for Biden, you dang sure better like whoever he picks for VP because that person could very well wind up President if Biden's dementia worsens.