Knox Chitiyo of the Royal United Services Institute (RUSI) joins Sir David to discuss the situation.
Chitiyo says that if a run-off were to occur, Morgan Tsvangirai would be firm favourite to win by a decisive margin.
However, Chitiyo says if Tsvangirai is elected there will be an enormous sense of expectation that will be hard to fulfill.
Also, James Miles, the China correspondent for The Economist, joins Sir David to discuss the tensions.
Miles was one of the few journalists in Tibet when the violence began.
He says the scale of the violence was unprecedented in China.
He also says that despite the justified grievances of ethnic Tibetans, without the Chinese, economic growth in the region would be seriously hindered.
