Mugabe's end game: How the president could leave power

Zimbabwe's President Robert Mugabe has defied expectations by not resigning, but the 93-year-old veteran leader will now face an impeachment process initiated by his own party.Article 96 of Zimbabwe's constitution says that the president can resign if he submits a letter to the parliament speaker, who must publicly announce it within 24 hours.Resignation would be the fastest, simplest and least risky way for Mugabe to leave power -- but that looks unlikely.