SAN DIEGO -- Ronald Reagan had just left office, the Christian Coalition was new, "values" had yet to become a buzzword of American politics and six of the current U.S. Supreme Court justices had other jobs when an atheist sued the city of San Diego for permitting a giant cross in a public park. Seventeen years later, the 29-foot concrete monument still crowns a hill over the Pacific, defended by the city's voters and members of Congress. Now the Supreme Court has stepped in, and the case of the Mount Soledad cross could help determine under what circumstances religious symbols...