Evolution of the political opinion landscape during electoral periods Tomás Mussi Reyero, Mariano G. Beiró, J. Ignacio Alvarez-Hamelin, Laura Hernández and Dimitris Kotzinos EPJ Data Sci., 10 1 (2021) 31 Published online: 05 June 2021 DOI: 10.1140/epjds/s13688-021-00285-8