LEIPZIG, GERMANY – MAY 23: German Chancellor Angela Merkel and German Social Democrats (SPD) Chairman Sigmar Gabriel attend the 150th anniversary celebration of the German Social Semocrats (SPD) on May 23, 2013 in Leipzig, Germany. The SPD, Germany’s main left-wing party, traces its history to the founding of the “Allgemeine Deutsche Arbeiterverein” (General German Workers’ Association) in Leipzig in May of 1863. (Photo by Thuringen Press – Pool/Getty Images)