Month-long protests against the authoritarian government of Tunisian President Zine el-Abidine Ben-Ali culminated on Friday with Mr. Ben Ali’s departure from the country and a state of emergency.  Mr. Ben Ali ruled Tunisia for more than two decades. During the weeks of protests, dozens of people were killed in clashes with police.  His apparent overthrow is the first time in recent memory that mass protests have forced out an Arab leader.  VOA's Ravi Khanna reports.