U.S. President Barack Obama attends the National Prayer Service at the National Cathedral in Washington on his first official day as president, January 21, 2009. From L-R are: first lady Michelle Obama, Obama, Vice President Joseph Biden, Jill Biden, former President Bill Clinton, and Hillary Clinton. Reuters Pictures 12 months ago

U.S. President Barack Obama attends the National Prayer Service at the National Cathedral in Washington on his first official day as president, January 21, 2009. From L-R are: first lady Michelle Obama, Obama, Vice President Joseph Biden, Jill Biden, former President Bill Clinton, and Hillary Clinton.