harare zimbabwean president robert mugabe set appoint woman deputy special rule party congress next month first lady say saturday add nothing wrong husband appoint 93-year-old mugabe hold power southern african nation since independence britain 1980 consistently refuse anoint successor argue rule zanu-pf party would choose replacement decide retire grace mugabe tell zanu-pf rally second city bulawayo party would amend constitution month change would adopt special december congress ensure one mugabe two deputies would woman allow mugabe appoint woman deputy could scuttle presidential ambition vice president emmerson mnangagwa see shoe-in succeed mugabe phelekezela mphoko second mugabe deputy lack political base mnangagwa nickname ngwena crocodile see political stock plummet last months accusations party rival plot get mugabe step favor deny accusation saturday grace crank pressure mnangagwa call root cause factionalism gnaw rule party also accuse vice president supporters boo give speech special congress november need constitution change accordingly go adopt proposal one vice presidents woman grace say speech broadcast state tv get vice president wrong party people know work hard want work wrong grace say visibly angry mugabe tell rally wife tire constant insult people identify mnangagwa supporters mugabe set appoint woman deputy eye wife