Elliot (3rd L), stand-in for U.S. President Barack Obama, takes part in the swearing-in at a dress rehearsal of the 57th Presidential Inaugural ceremony on the West Steps of the U.S. Capitol in Washington D.C., capital of the United States, Jan. 13, 2013. U.S. President Barack Obama will be ceremonially sworn in for a second four-year term on January 21. [Xinhua]