If Mitt Romney loses his run for the White House, a turning point will have been his decision Monday to absolve President Obama of raising taxes on the middle class. He is managing to turn the only possible silver lining in Chief Justice John Roberts's ObamaCare salvage operation—that the mandate to buy insurance or pay a penalty is really a tax—into a second political defeat.

Appearing on MSNBC, close Romney adviser Eric Fehrnstrom was asked by host Chuck Todd if Mr. Romney "agrees with the president" and "believes that you...