 In June 2005, he withdrew from the Social Democratic Party in protest of its policies and joined the Left Party for whom he subsequently became an opposition MDB in the September 2005 elections.His move prompted the defection of German Federal Constitutional Court justice Wolfgang Neskovic, and the former SPD leader in Baden-Württemberg, Ulrich Maurer from the Social Democrats to the Left Party.Hakkı Keskin is married with two children.