The 'Day of Departure' in Egypt?

Yesterday's bloody violence has been replaced by uneasy calm as tens of thousands of protesters have gathered following Friday prayers. Pro-Mubarak forces have disappeared and the Army has increased its presence, as the growing crowd demands that Egypt's President Hosni Mubarak resign before the end of the day. It's being reported that the Obama White House is trying to negotiate Mubarak's departure, at the same time creating an interim government that would then give way to democratic elections.  Is there any chance for a constitutional democracy? We get updates from Cairo and Washington.