It seems that everyone here has a deep ignorance of Spain or do not know how to read data at all.
Sanchez has called elections to phagocytize Podemos and neutralize Sumar, not to help them haha. The PSOE has never, literally never had good relations with the parties to its left and if anything these elections have shown apart from an undisputed victory of the right, is that Podemos and Sumar are in a moment where a hard blow, could make them disappear.
With the calling of elections, Sanchez, although it is impossible for him to get another government, assures himself to keep more than 100 seats, maybe even to grow (as it happened in Valencia) thanks to the foreseeable disappearance of Podemos and to the poorly formed and badly organized project of Sumar.
The answer to this debacle has come with the electoral advance. According to the PSOE, in this way Sánchez manages to neutralize "internal criticisms". In addition, he forces "the left to come to an agreement quickly". In that sense, Sánchez seeks to agglutinate the left-wing vote in the face of the wear and tear of the battle waged by Podemos and Sumar, of Yolanda Díaz.
"It is difficult for anyone to ask for his resignation now," they recognize in the PSOE. "The party has to stay in electoral mode and mobilize to avoid another disaster." "If, in addition, there is no agreement to our left, the president will kill Podemos and all the parties of that spectrum," they add.
https://www.vozpopuli.com/espana/sanchez-psoe-rebelion-elecciones.html
So Sanchez loses in any case.