With a new party in power in Japan for only the second time in a half-century, many people were expecting a sea change in how the country is run. But the birth of a true two-party system is proving difficult. Japan's political structure is written into law, and rearranging it is complicated. The Democratic Party of Japan's economic policies are aimed more at fairness than GDP growth, which makes it hard to satisfy Japanese concerns about economic doldrums. On the foreign policy side, the U.S. benefited from the one-party system it helped to construct, and the re-weighting of policies toward China and away from the U.S. is ruffling feathers in Washington.