Obama sworn in during private ceremony

WASHINGTON, DC - JANUARY 20: Alvin Martin places barriers in place on the National Mall as preparations continue for the Inauguration ceremony on January 20, 2013 in Washington, DC. The U.S. capital is preparing for the second inauguration of U.S. President Barack Obama, which will take place on January 21. (Photo by Joe Raedle/Getty Images)

WASHINGTON, DC - JANUARY 20: Alvin Martin places barriers in place on the National Mall as preparations continue for the Inauguration ceremony on January 20, 2013 in Washington, DC. The U.S. capital is preparing for the second inauguration of U.S. President Barack Obama, which will take place on January 21. (Photo by Joe Raedle/Getty Images)