Equo is a Spanish green party that, through its integration into the Valencian Coalició Compromís ("Compromise Coalition" in English), attained representation in the Congress of Deputies after the 2011 elections as the "Compromís-Q".
The Spanish Socialist Workers' Party ("Partido Socialista Obrero Español" or "PSOE" in Spanish) is the principal left-winged Spanish political party and the one that has spent the most years in parliamentary majority since the Transition (1982-1996, 2004-2011).