ZANU-PF leader Robert Mugabe, elected prime minister in 1980, revised the constitution in 1987 to make himself president. President Mugabe's affiliated party won every election from independence on April 18, 1980, until it lost the parliamentary elections in March 2008 to the Movement for Democratic Change. In some quarters corruption and rigging elections have been alleged. In particular the elections of 1990 were nationally and internationally condemned as being rigged, with the second-placed party, Edgar Tekere's Zimbabwe Unity Movement, winning only 20% of the vote. Presidential elections were held in 2002 amid allegations of vote-rigging, intimidation, and fraud, and again in March 2008.