Zimbabwean opposition lawmakers walked out of President Emmerson Mnangagwa’s state of the nation address to parliament on Tuesday, signalling their lingering bitterness after losing a disputed July 30 presidential and parliamentary election. Members of Parliament from the Movement for Democratic Change (MDC) that is led by Nelson Chamisa heckled Mnangagwa when he started reading his speech before filing out. Chamisa – who is not a member of parliament and lost a court challenge to Mnangagwa’s win last month – maintains that he was cheated of victory by the electoral board and says the 76-year-old president lack legitimacy. After leaving parliament, the MDC lawmakers broke into song denouncing the ruling ZANU-PF party. “As the MDC we cannot sit there and be…