The SCOTUS jurisdiction does not extend into the local electoral precincts-where the bulk of fraud occurs.
Actually it does. In Bush v Gore, the court (in a ruling they have apparently since forgotten), said that you couldn't change the rules in mid-stream. The rules (actual law) on the ground for election day persist through the process to conclusion. It is unfortunate that just about every court in the nation has now apparently thrown that ruling out the window.