Tens of thousands of Egyptians flooded into Cairo's Tahrir Square  on Monday night for a third day of protests against the country's transitional military leaders. Activists hope to capitalize of the resignation of Egypt's  civilian cabinet, calling for a million-strong demonstration on Tuesday. Security forces and protesters have  clashed violently, recalling the events that led to the ouster of former president Hosni Mubarak. Elections scheduled for next week are  now uncertain. Michael Wahid Hanna, fellow at The Century Foundation, explains why the civilian cabinet offered its resignation. David Kirkpatrick, Cairo bureau chief for The New York Times, reports on the latest.