Social Democratic Party (SPD) leader Sigmar Gabriel (C) walks past SPD General Secretary Andrea Nahles (R) and SPD treasurer Barbara Hendricks as he arrives for a meeting of the party leadership in Berlin on December 15, 2013 after Germany's centre-left Social Democrats approved yesterday the formation of a "grand coalition" government under Chancellor Angela Merkel.  AFP PHOTO / JOHN MACDOUGALL        (Photo credit should read JOHN MACDOUGALL/AFP/Getty Images)