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Marzouki became President of Tunisia in 2011, after the Tunisian Revolution led to the overthrow of President Zine El Abidine Ben Ali. He served as the country's first democratically elected president during a transitional period, overseeing the drafting of a new constitution and the holding of parliamentary elections. Marzouki's presidency was marked by political instability and economic challenges, but he played a crucial role in Tunisia's democratic transition.