Michelle Obama: It's a 'sacrifice' to travel to Europe to pitch for the Olympics. For Oprah and the president, too. But we're doing it for the kids. By: Byron York Chief Political Correspondent09/30/09 5:12 PM EDT In her speech in Copenhagen today, First Lady Michelle Obama said her trip to Denmark, along with the travel of her "dear friend" and "chit-chat buddy" Oprah Winfrey, as well as tomorrow's visit by President Obama, is a "sacrifice" on behalf of the children of Chicago and the United States. "As much of a sacrifice as people say this is for me or...