Ballot stuffing usually does not help Democrats down ballot—and if you think about it is obvious why this is the case.
In some cases Congressional districts are gerrymandered all over the place so it is very difficult to get the correct Congressional candidates on ballots shipped from a central location.
This is even more obvious on state legislature races.
That is why congressional Democrats are freaking out—even if the Democrats can cheat their way to the White House it cannot save them down ballot.
Yup——downticket Dems’ problems are putting Biden in jeopardy.