In January 2001, he replaced Ion Diaconescu as PNŢCD president, but resigned from this position in July 2001, amid political tensions within the party.
His work touches a variety of subjects, including the philosophical theories of Herbert Marcuse and Jürgen Habermas, the nature of positivism, and trends in contemporary philosophy.
[2] He has also lectured on specific subjects, such as the philosophic foundations of transition from Communism to a market economy, and the evolution of principles guiding European integration.
[5] Marga also criticized the system for relying on "original features" and "Romanian traditions", which had been explained as a means to promote national development, but, in effect, had contributed to the gap between Romania and the Western world.
[8] The decision was in turn based on a promise made to their coalition partner, the Democratic Union of Hungarians in Romania (UDMR).
His tenure failed to bring in the rapid changes desired and opposition from prominent conservative elements in his party stifled his ideas.