The Popular Socialist Party (Spanish: Partido Socialista Popular) was a political party in Argentina formed in 1972 with the merger of the Argentine Socialist Party, the Movimiento de Acción Popular Argentino (MAPA) and other minor groups. Although Cavallero turned to Carlos Menem and Justicialism, and then founded his own party, Binner became the first Socialist governor of Argentina following the 2007 general elections, being elected in the Province of Santa Fe.