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As if being the prime minister of Zimbabwe--a nation wracked by economic devastation, starvation, and political oppression for the past decade--was not a difficult enough job, Morgan Tsvangirai must also share power with President Robert Mugabe. Tsvangirai, who has led the opposition Movement for Democratic Change (MDC) since its inception in 1999, became prime minister in a power-sharing accord brokered with Mugabe in early February, almost a year after he and the MDC defeated Mugabe and his ZANU-PF in an election fraught with irregularities. He is now on a three-week tour of Western capitals, asking governments that once branded Zimbabwe...