Obama arrived in Washington on Sunday, following Michelle and daughters, Malia and Sasha, who came Saturday. The girls are set to start school at Sidwell Friends Monday, and the president-elect is ready to get to work. Only 15 days till inauguration! The family will stay at the Hay-Adams Hotel until Jan. 15. They'll then move into the Blair House, a government-owned guesthouse, according to inauguration tradition.