(L-R) U.S. President Barack Obama prays with Speaker of the House Paul Ryan (R-WI), Senate Majority Leader Mitch McConnell (R-KY) and Senate Minority Leader Harry Reid (D-NV) after speaking at a Congressional ceremony, celebrating the 150th anniversary of the ratification of the 13th Amendment to the U.S. Constitution to end slavery, on Capitol Hill in Washington December 9, 2015. REUTERS/Gary Cameron REUTERS/Gary Cameron