A growing body of literature studies the relationship between changes in issue salience and parties’ electoral success. Focusing on Green and Far-Right parties, researchers debate which issues allow these parties to grow beyond their core niche. Yet, little is known about the relationship between issue salience and the electoral success of Radical Left Parties. Using data from the Chapel Hill Expert Survey and the European Election Studies we estimate changes to parties’ expected vote shares as functions of changes in the salience of policy issues. Unlike Green and Far-Right parties, we show that RLP do not enjoy electoral advantages when their core issue (economic redistribution) is salient. Rather, RLP can make (modest) electoral gains when the issue of European integration increases in salience.