Not long after many Americans started social distancing in an effort to slow the spread of coronavirus, Ohio’s director of health, Dr. Amy Acton, delayed that state’s primary election, which was originally scheduled for March 17. She did so with the blessing of Republican Gov. Mike DeWine and of the state Supreme Court. As a matter of law, this decision to delay the election is defensible, and there is no evidence that Acton or DeWine acted in bad faith — their efforts to postpone the election appear to be motivated by a genuine desire to slow the spread of the coronavirus pandemic. But this delay of a state primary election understandably triggered fears that other officials, potentially even President Trump, might take advantage of the Ohio precedent to postpone or cancel November’s election if it appears that Trump is likely to be defeated.