President Obama once said that as President he aspired to be the progressive Ronald Reagan, and as he prepares to leave office he has succeeded in fundamental if ironic ways.

While Reagan left behind a calmer, more optimistic country, Mr. Obama leaves a more divided and rancorous one. While the Gipper helped elect a successor to extend his legacy, Mr. Obama will be succeeded by a man who campaigned to repudiate the President’s agenda. Barack Obama has been a historic President but perhaps not a consequential one.

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