I watched one of the hearings of election fraud in Michigan. Two Republican poll watchers had a very believable story in that the poll worker was tilting the process to the D's; i.e. the poll worker was not neutral and was using his position unfairly.
At the end of this hour long interview between the poll watchers and the commission, the Republican representative on the commission asked this great question: "How many ballots do you believe were affected?"
The poll watcher replied: "About 30 or 40".
Hardly enough to turn the election around!
The electoral systems are well in place such that cheating poll workers really can't bring in hundreds and thousands of extra votes. And if the Democrat Party was instructing hundreds of poll workers to get 30 or 40 votes in a similar way, there would be a big trail of evidence worthy of further investigation. And the responsibility should lie with the Republican legal team to make the case.
Unfortunately, the believable story of 30 or 40 votes being stolen gets blown up into outright fraud. I'm pretty sure the R's had similar operatives in polling stations across the USA.