July 31 - Zimbabwean PM Morgan Tsvangirai in his third attempt to unseat President Robert Mugabe, who has ruled Zimbabwe since 1980. Lily Grimes reports.
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Africa's oldest leader casts his vote.
Robert Mugabe has been President of Zimbabwe since independence from Britain in 1980.
It's opposition leader Morgan Tsvangirai's third attempt to unseat the 89-year-old.
Asked if he's winning, he expressed confidence.
(SOUNDBITE) (English) MDC LEADER, MORGAN TSVANGIRAI, SAYING:
"Well I thought that it's not 'if', it's 'when.'''
Despite the cold, queues formed outside polling stations before dawn.
With no reliable opinion polls it's hard to see who's winning.
Both sides are forecasting landslide victories but in a country with a history of election violence the big question is whether the loser will accept the result.
Mugabe, who rejects past and present charges of vote-fixing, has said he will concede if defeated.
A spokesman for Tsvangirai's Movement for Democratic Change said the party would accept the results only if the poll was "free and fair".
African Union observers say voting has gone well so far.
Western monitors have been barred from the elections.