President Obama once promised to remake America's image around the globe. He has kept that promise—only not in the way many voters who backed him had hoped.

Mr. Obama's latest step in the image makeover is to tell Canada—the U.S.'s largest trading partner, largest supplier of energy and most loyal ally in war and peace—that its long-nurtured special relationship with the U.S. is not so special after all. To carry out the mission, Mr. Obama has sent a new U.S. ambassador to Ottawa.

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