A second deadlock, in United States v. Texas, left in place a nationwide injunction blocking Mr. Obama’s plan to spare more than four million unauthorized immigrants from deportation and allow them to work. That was unfortunate, Justice Ginsburg said, but it could have been worse.

“Think what would have happened had Justice Scalia remained with us,” she said. Instead of a single sentence announcing the tie, she suggested, a five-justice majority would have issued a precedent-setting decision dealing a lasting setback to Mr. Obama and the immigrants he had tried to protect.