GERMANY-POLITICS-SPD-ANNIVERSARY

French President Francois Hollande (L) and German Social Democratic Party (SPD) leader Sigmar Gabriel (R) arrive at the Gewandhaus concert hall in Leipzig, eastern Germany, to attend the festivities that mark the German social democratic SPD party's 150th anniversary on May 23, 2013. The SPD, Europe's oldest political party, has invited nearly 50 current and former heads of state and government as it celebrates 150th birthday and its turbulent history, which saw it advance workers rights and suffer persecution by the Nazis. The SPD was founded on May 23, 1863 in Leipzig as the 'Allgemeiner Deutscher Arbeiterverein' (common German worker's club). AFP PHOTO / POOL / KAY NIETFELD (Photo credit should read KAY NIETFELD/AFP via Getty Images)