For the Supreme Court to issue a unanimous opinion, legal minds as vastly different as Antonin Scalia and Ruth Bader Ginsburg, must find agreement, as well as everyone in between.

That rarely happens on contentious or unclear issues. Unanimity on the court usually signals that the resulting opinion is a simple application of common sense with which no reasonable person could disagree. This has occurred many times at the Obama administration’s expense, but this week the court issued a unanimous opinion that instead puts a key White House ally — the trial lawyer lobby — on the spot.