Leaders: The champion of Polish freedom tells America it's no longer that shining city on a hill. As it slouches toward socialism, he warns, those yearning to breathe free in the world can no longer look to the U.S. for help. They were the giants of their age. Together, President Ronald Reagan, British Prime Minister Margaret Thatcher, Pope John Paul II and a little known shipyard worker named Lech Walesa stood up to Soviet communism and brought freedom to the captive nations of Europe. Last Friday, Walesa was in Chicago campaigning for a GOP gubernatorial candidate in the Illinois...