In 1917 he became a contributor to the newspaper El Sol, where he published, as a series of essays, his two principal works: España invertebrada (Invertebrate Spain) and La rebelión de las masas (The Revolt of the Masses).
Elected deputy for the Province of León in the constituent assembly of the Second Spanish Republic, he was the leader of a parliamentary group of intellectuals known as Agrupación al Servicio de la República[REF] ("The Grouping at the Service of the Republic"), but he soon abandoned politics, disappointed.