Yukio Hatoyama, the 62-year-old president of the Democratic Party of Japan, is expected to be formally installed Wednesday as prime minister when the new parliament convenes.

• 他现在的首要挑战是，消除党内以及与合作伙伴之间的意见分歧，以便能实现他竞选时的承诺，这些承诺帮助日本民主党以压倒性优势赢得大选。