Zimbabwe's opposition has obtained evidence that President Robert Mugabe won re-election in March last year with the help of as many as 1.8m "ghost" voters who were added to the electoral roll. Tobaiwa Mudede, the registrar-general and a Mugabe loyalist, has repeatedly refused requests by the Movement for Democratic Change for a copy of the roll to be used in a court action challenging the result - even though the roll is a public document.