Description:In Tunisia's parliament, a new president is sworn-in. Secularist Moncef Marzouki will serve under the recently elected Islamist government. The 66-year-old was imprisoned for opposing former President Zine al-Abidine Ben Ali's regime, and many are heralding his election as another step for the revolution that toppled the former leader. But some opposition lawmakers cast blank ballots to protest the Islamist leadership they fear will reverse revolution gains.(1:15)