 De la Rúa, however, could not manage an economic crisis and finally resigned on December 21, 2001, amid violent riots.Several short-lived interim presidents came and went until Congress chose Eduardo Duhalde of the Justicialist Party (Peronist) to rule until some sort of social and economic peace could be restored.Duhalde took care of the most critical matters and called for democratic elections, which Néstor Kirchner of the Justicialist Party won (in the first use of the ballotage system).