From law professor Glenn Reynolds at Instapundit:
The Court revamped "state legislative districting" in 1964.
The State of Texas filed a lawsuit directly with the U.S. Supreme Court shortly before midnight on Monday challenging the election procedures in Georgia, Michigan, Pennsylvania, and Wisconsin on the grounds that they violate the Constitution.
Texas argues that these states violated the Electors Clause of the Constitution because they made changes to voting rules and procedures through the courts or through executive actions, but not through the state legislatures. Additionally, Texas argues that there were differences in voting rules and procedures in different counties within the states, violating the Constitution’s Equal Protection Clause. Finally, Texas argues that there were “voting irregularities” in these states as a result of the above.
If the Supreme Court can revamp state legislative districting in the name of fairness, I see nothing to stop if from supervising state procedures for electing presidents.