The leftist movement is not one party or organization but a complex interaction between both political and cultural groups that have progressive and leftist values. Medvedev himself is one of the main theorists of the leftist movement and his neo-Marxist Communist Party is considered one of the main forces in the movement. Recently the movement has known a growth in strength with the election successes of new political parties as the New Lovian Socialists and the Labor and Liberal Centrist Party.