On October 7, the U.S. Supreme Court refused to hear a Connecticut case, Feehan v Marcone, 18-1470. The state courts had refused to order a new legislative election following the November 2018 regular election in one particular district. The margin between the Republican and the Democrat was extremely close, and then it became known that a number of voters larger than the margin had accidentally been given ballots that omitted that race. The state courts said there was no evidence that if those voters had been allowed to vote, the outcome would have been different. Of course it would have been impossible for there to be any such evidence. It is the Republican nominee who had brought this lawsuit.

Also on October 7, the U.S. Supreme Court refused to hear a Washington state case, Save Tacoma Water v Port of Tacoma, 18-1518. The issue was whether a nonjudicial government official has the power to invalidate an initiative petition (even though it has enough valid signatures) if he or she thinks the initiative, if passed, would be unconstitutional or illegal.