It's all they've got. It's nothing.
They can't run on Biden's record, because it's one of disaster after disaster.
They can't run on her presidential record, because there is none.
I guess they'll have to run on her record in the senate, where she graded out as more liberal than Bernie Sanders.
Or, they could run on her record in Taxifornia, where she was a total disaster who clearly didn't feel the need to hide the fact that she's a socialist, left of Bernie and AOC, etc.
If she were in the House, she'd be a member of the squad.
This will not be received well in the states where (what is now) her campaign is struggling. She will not be received well by the working class. At least Scranton Demented Joe could lie/exaggerate about being working class at some point in his life.