It’s not just what’s written in stone. There are also many unwritten traditions we Americans respect. One of the most important, following the example of George Washington — who, once he left office, went back to Mount Vernon and was never heard from again — is that former presidents sit on the sidelines and resist the temptation to criticize their successors, no matter how much they disagree.
That tradition has been a great blessing. For more than 200 years, it has...