Frost over the World - Zimbabwe - 30 Jan 09

Knox Chitiyo, the head of the African unit at UK think-tank RUSI, joins Sir David to discuss the recent decision by Zimbabwean opposition leader, Morgan Tsvangarai, to join a unity government with President Robert Mugabe. Plus, as Barack Obama faces his first major challenges in office, Sir David catches up with former Clinton aide, Laura Schwartz, to find out exactly how he is getting on in his new job.