Poles and Polish-Americans expressed outraged Tuesday at President Obama’s reference earlier that day to “a Polish death camp” — as opposed to a Nazi death camp in German-occupied Poland. “The White House will apologize for this outrageous error,” Foreign Minister Radek Sikorski tweeted. Sikorski said that Polish Prime Minister Donald “Tusk will make a statement in the morning. It’s a pity that this important ceremony was upstaged by ignorance and incompetence.” The president had been trying to honor a famous Pole, awarding a Presidential Medal of Freedom to Jan Karski, a resistance fighter who sneaked behind enemy lines to bear...